# AN2653 Application note

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Application note Operational amplifier stability compensation methods for capacitive loading applied to TS57 Introduction Who has never experienced oscillations issues when using an operational amplifier? Opamps are often used in a simple voltage follower configuration. However, this is not the best configuration in terms of capacitive loading and potential risk of oscillations. Capacitive loads have a big impact on the stability of operational amplifier-based applications. Several compensation methods exist to stabilize a standard op-amp. This application note describes the most common ones, which can be used in most cases. The general theory of each compensation method is explained, and based on this, specific data is provided for the TS57. The TS57 is a high precision rail-to-rail amplifier, with very low input offset voltage, and a.9 MHz gain bandwidth product, which is available in SOT23-5 and SO-8 packages. This document simplifies the task of designing an application that includes the TS57. It spares you the time-consuming effort of trying numerous combinations on bench, and it is also much more accurate than using Spice models which are not designed to study system stability, even though they can give a general trend. November 27 Rev /22

2 Contents AN2653 Contents Stability basics Introduction Operational amplifier modeling for stability study Stability in voltage follower configuration Out-of-the-loop compensation method Theoretical overview Application on the TS In-the-loop compensation method Theoretical overview Application on the TS Snubber network compensation method Theoretical overview Application on the TS Conclusion Revision history /22

3 Stability basics Stability basics. Introduction Consider a linear system modeled as shown in Figure. Figure. Linear system with feedback model Vin - A ß Vout The model in Figure gives the following equation: V out = A V + Aβ in A is named closed loop gain. + Aβ From this equation, it is evident that for Aβ = -, the circuit is unstable (V out is independent of V in ). Aβ is the loop gain. To evaluate it, the loop is opened and -V r /V s is calculated as shown in Figure 2. Figure 2. Loop gain calculation Vs - Vr A ß Vout Opening the loop leads to the following equation: V r = Aβ V s If a small signal V s is sourced into the system, and if V r comes back in phase with it with an amplitude above that of V s (which means that Aβ is a real number greater than or equal to ) then the system oscillates and is unstable. This leads to the definition of the gain margin, which is the opposite of the loop gain (in db) at the frequency for which its phase equals -8. The bigger the gain margin, the more stable the system. In addition, the phase margin is defined as the phase of the loop gain plus 8 at the frequency for which its gain equals db. Therefore, from the value of Aβ it is possible to determine the stability of the system. 3/22

4 Stability basics AN Operational amplifier modeling for stability study Figure 3 illustrates the definition of phase and gain margins in a gain configuration. Figure 3. Illustration of phase and gain margins Figure 4. TS57 open loop gain Gain (db) Phase Margin Loop Gain Gain Margin Phase ( ) Gain (db) TS57 Open Loop Gain Vicm = 2.5 V Phase ( ) E+.E+.E+2.E+3.E+4.E+5.E+6.E+7.E E-2.E-.E+.E+.E+2.E+3.E+4.E+5.E+6.E+7-8 Frequency (Hz) Frequency (Hz) Gain Phase Gain Phase To apply this stability approach to operational amplifier based applications, it is necessary to know the gain of the operational amplifier when no feedback and no loads are used. It is the open loop gain (A(ω )) of the amplifier (shown in Figure 4 for the TS57). From this parameter, it is possible to model the amplifier and to study the stability of any gain configuration. Figure 5. Equivalence between schematics and block diagram The loop gain is: V r = A( ω) V s R g R f + R g This equation shows the impact of the gain on the stability: if R f /R g increases, the closed loop gain of the system increases and the loop gain decreases. Because the phase remains the same, the gain margin increases and stability is improved. In addition, if you consider the case of a second order system such as the one shown in Figure 6, a decrease of the loop gain allows to pass the db axis before the second pole occurs. It minimizes the effect of the phase drop due to this pole, and as a result, the phase margin is higher. Therefore, a voltage follower configuration is the worst case for stability. 4/22

5 Stability basics Figure 6. Impact of closed loop gain on stability G loop gain (db) Case Case 2 f Closed Loop Gain (Case) < Closed Loop Gain (Case 2) Another parameter that impacts stability is the amplifier output impedance Z o. Including this parameter in the model of the amplifier leads to the model shown in Figure 7. Figure 7. Follower configuration model with capacitive load for loop gain calculation Figure 8. TS57 output impedance Z o TS57 Output Impedance (Zo).E+5 9 Impedance (Ohm).E+4.E+3.E+2.E E+.E-2.E-.E+.E+.E+2.E+3.E+4.E+5.E+6.E+7 Phase ( ) -35 Frequency (Hz) Impedance Phase Z o is neither constant over frequency nor purely resistive. Figure 8 shows how the output impedance varies with the frequency in the case of the TS57. These variations complicate the stability study. Finally, to study the stability of an op-amp based system, two parameters need to be taken into account in order to better fit reality: the amplifier open-loop gain and the amplifier output impedance. Then, a calculation of the loop gain indicates how stable the system is. 5/22

6 Stability in voltage follower configuration AN Stability in voltage follower configuration This section examines a voltage follower configuration because it is the worst case scenario for stability (compared with a gain configuration). Figure 9. Voltage follower configuration Figure. Closed loop gain measured for a voltage follower configuration Gain (db) Voltage Follower Configuration - Closed Loop Gain -4.E+3.E+4.E+5.E+6.E+7 RL = kω Without CL CL=55 pf Frequency (Hz) Gain without CL Gain with CL = 55 pf In voltage follower configuration, the loop gain is: V r = A( ω) V s Z o + jz o C L ω The capacitive load adds a pole to the loop gain that impacts the stability of the system. The higher the frequency of this pole, the greater the stability. In fact, if the pole frequency is lower than or close to the unity gain frequency, the pole can have a significant negative impact on phase and gain margins. It means that the stability decreases when the capacitive load increases. Without C L, the system is stable. However, Figure and Figure 2 show, for the TS57, the oscillations due to instability with and without an AC input signal for a capacitive load of 55 pf. The oscillation frequency is in line with the peaking frequency observed in a closed loop gain configuration (approximately.9 MHz according to Figure ). 6/22

7 Stability in voltage follower configuration Figure. Input and output signals measured with grounded input Figure 2. Input and output signals measured for an AC input signal Amplitude (V) Voltage Follower Configuration - Output Signal with Input Grounded RL = kω CL = 55pF Amplitude (V) Voltage Follower - Input and Output Signals RL = kω CL = 55 pf Time (μs) Time (μs) Output Signal Input Signal Output Signal Input Signal To remove this instability and work with higher capacitive loads, many compensation methods exist, and this application note examines some of them. By adding zeroes and poles to the loop gain, stability can be improved. However, compensation components have to be chosen carefully. A compensation scheme can indeed improve stability, but can also lead the system to instability, depending on the choice of component values. Similarly, a compensation configuration can work for a specific load, but modifying this load can affect stability. 7/22

8 Out-of-the-loop compensation method AN Out-of-the-loop compensation method 3. Theoretical overview A simple compensation method, using only one extra component, consists in adding a resistor in series between the output of the amplifier and its load (see Figure 3). It is often referred to as the out-of-the-loop compensation method because the additional component (R OL ) is added outside of the feedback loop. The resistor isolates the op-amp feedback network from the capacitive load. Figure 3. Out-of-the-loop compensation schematics Figure 4. Out-of-the-loop equivalent schematics for loop gain calculation From Figure 4, the loop gain with this compensation method is: V r V s = A( ω) R OL R jr C ω OL L L R OL + Z o + jz ( o + R OL )C L ω This compensation introduces a zero in the loop gain, just after the pole caused by the capacitive load, at: π R OL C L This pole is also unfortunately shifted to lower frequencies at: π ( Z o + R OL ) C L However, due to the zero, the effect of the pole is minimized and the stability is improved. To obtain a good level of stability, R OL must be chosen such that the frequency of the zero occurs at least one decade before unity-gain frequency. It then allows a significant shift of the phase and therefore increase phase and gain margins. The previous equation shows that if R OL >> Z o, then -V r /V s = A(ω ), and the circuit is stable. In that case, pole and zero occur at the same frequency. However, the value of R OL is limited by the load impedance, R OL and acting as a a divider bridge from the operational amplifier output. Therefore, in order to minimize the error on V out, R OL must be very small compared to (for example, a maximum of %, but this criterion depends on the required accuracy). Finally, this compensation method is effective, but the drawback is a limitation on the accuracy of V out depending on the resistive load value. 8/22

9 Out-of-the-loop compensation method 3.2 Application on the TS57 This compensation method brings very good results in terms of stability, improving strongly the phase and gain margins. Table and Table 2 show the results obtained for different load conditions, in the case of voltage follower and gain configurations. Note that R OL is limited to % of even though better results can be obtained with higher values of R OL. Table. Results of out-of-the-loop compensation for different load conditions in the case of a voltage follower configuration for TS57 =kω =kω =kω C L R OL f (Ω) u /f () Mg (2) Mϕ (2) R OL z f (db) (degree) (Ω) u /f () Mg (2) Mϕ (2) R OL Mg (2) Mϕ (2) z f (db) (degree) (kω) u /f z (db) (degree) nf nf nf f u /f z cells are shaded when the value is lower than, which is not the best case due to R OL limitation. 2. Negative values indicate instability. Table 2. Results of out-of-the-loop compensation for different load conditions in the case of a gain configuration of either - or + (R g = Ω and R f = kω) for TS57 =kω =kω =kω C L R OL () Mg (2) Mϕ (2) R f (Ω) u /f OL () Mg (2) Mϕ (2) R z f (db) (degree) (Ω) u /f OL Mg (2) Mϕ (2) z f (db) (degree) (kω) u /f z (db) (degree) nf nf nf f u /f z cells are shaded when the value is lower than, which is not the best case due to R OL limitation. 2. Negative values indicate instability. As expected, Table and Table 2 show that the higher the value of R OL, the better the compensation (because the best R OL is always its maximum value /). These results also show that, for a voltage follower configuration, this compensation method does not work with low (and low C L ), because the zero frequency cannot be one decade before the unity-gain frequency of the open loop gain. In the case of the TS57, it works well only if the R OL.C L product is above -6. 9/22

10 Out-of-the-loop compensation method AN2653 Figure 5 and Figure 6 show the loop gain and closed loop gain respectively. These curves are plotted for =kω and C L =nf. Figure 5. Loop gain Figure 6. Measured closed loop gain Gain (db) E-2 Voltage Follower Configuration - Loop Gain Compensation with the Out-of-the-Loop Technique.E-.E+.E+.E+2.E+3 Frequency (Hz) Gain without Compensation Phase without Compensation.E+4.E+5 RL = kω CL = nf.e+6.e+7 Gain with ROL = Ω Phase with ROL = Ω Phase ( ) Gain (db) E+3 Voltage Follower Configuration - Closed Loop Gain Compensation with the Out-of-the-Loop Technique With Out-of-the-Loop Compensation Technique.E+4.E+5 Frequency (Hz) Gain without Compensation Without Compensation.E+6 RL = kω CL = nf Gain with ROL = Ω.E+7 Both figures further demonstrates the stability improvement. Note that the fact that Z o is almost a self at high frequencies (for the TS57) explains the presence of peaking in the loop gain curve, depending on the load capacitor. This is because the denominator is equal to R OL j L ( ω) + R OL C L ω L ( ω )C L ω 2 with Z o = jl(ω )ω. It leads to a resonance frequency of approximately π L( ω)c L For the peaking frequency f = π L( ω)c L the damping is given by the term: L ( ω) + R OL C L ω When there is no compensation, it is only: L ( ω) With the compensation, at the resonance frequency, L ( ω) «R OL C L ω therefore the peaking is attenuated. To help implement the compensation, the abacus given in Figure 7 to Figure 2 provide the R OL value to choose for a given C L and phase/gain margins. These abacus are plotted in the case of a voltage follower configuration and a gain configuration of - or +, with a load resistor of kω.. /22

11 Out-of-the-loop compensation method Figure 7. Gain margin abacus in the case of a voltage follower configuration Figure 8. Phase margin abacus in the case of a voltage follower configuration Voltage Follower Configuration - Gain Margin Abacus Applied for Out-of-the-Loop Compensation Method Voltage Follower Configuration - Phase Margin Abacus Applied for Out-of-the-Loop Compensation Method STABLE RL = kω STABLE RL = kω ROL (Ω) ROL (Ω). UNSTABLE. UNSTABLE...E-.E-.E-9.E-8.E-7.E-6.E-5.E-4.E-.E-9.E-8.E-7.E-6.E-5.E-4 CL (F) CL (F) R ( db) R (4 db) R (8 db) R (2 db) R (6 db) R ( ) R ( ) R (2 ) R (3 ) R (4 ) Figure 9. Gain margin abacus in the case of a gain configuration of - or + Figure 2. Phase margin abacus in the case of a gain configuration of - or + Gain Configuration of either - or + - Gain Margin Abacus Applied for Out-of-the-Loop Compensation Method Gain Configuration of either - or + - Phase Margin Abacus Applied for Out-of-the-Loop Compensation Method STABLE STABLE RL = kω RL = kω ROL (Ω) ROL (Ω). UNSTABLE....E-.E-.E-9.E-8.E-7.E-6.E-5.E-4.E-.E-9.E-8.E-7.E-6.E-5.E-4 UNSTABLE CL (F) CL (F) R ( db) R ( db) R (2 db) R (3 db) R ( ) R (2 ) R (4 ) R (6 ) /22

12 In-the-loop compensation method AN In-the-loop compensation method 4. Theoretical overview Figure 2 shows a commonly used compensation method, often called in-the-loop, because the additional components (a resistor and a capacitor) used to improve the stability are inserted in the feedback loop. Figure 2. In-the-loop compensation schematics Figure 22. In-the-loop equivalent schematics for loop gain calculation The loop gain in this configuration, corresponding to Figure 22, is the following: V r V s A( ω) [ + jr IL C IL ω] = Z o + R IL Z + + jz ( o + R IL )C L ω+ jr IL o CIL ω Z o R IL C IL C L ω 2 It adds a zero and splits the pole caused by the capacitive load into two poles in the loop gain. This compensation method allows, by a good choice of compensation components, to compensate the original pole (caused by the capacitive load), and then to improve stability. The main drawback of this circuit is the reduction of the output swing, because the isolation resistor is in the signal path. Note that, for the following cases, R IL is limited to % of (or R f // in the case of a gain configuration) even if better results can be obtained with higher R IL values. But because the feedback loop is taken directly on V out, the R IL / divider bridge does not create inaccuracy on V out as it does with the out-of-the-loop method. 4.2 Application on the TS57 In the case of the TS57, the first pole of the loop gain caused by the feedback occurs around: Z o R IL R L Z 2π ( Z o + R IL )C L + R IL o 2π ( R IL )( C IL + C L ) CIL 2/22

13 In-the-loop compensation method The second one occurs at higher frequencies where its impact on stability is limited. The goal of the first pole is to decrease the loop gain to get closer to db, just before the zero, occurring at π R IL C IL whose goal is to minimize the phase shift caused by the pole. The stability is increased as the loop gain crosses the db axis with a limited phase shift. It minimizes the effect of the second pole caused by the feedback, which is also pushed toward higher frequencies. Although this compensation method may seem difficult to set up, it brings very good results, as shown in Table 3 and Table 4, for the TS57 operational amplifier. Table 3. Results of in-the-loop compensation for different load conditions in the case of a voltage follower configuration for TS57 =kω =kω =kω C L R () IL C IL Mg (2) Mϕ (2) () R IL C IL Mg (2) Mϕ (2) () R IL C IL Mg (2) Mϕ (2) (Ω) (nf) (db) (degree) (kω) (nf) (db) (degree) (kω) (nf) (db) (degree) nf nf nf R IL cells are shaded when its value is clamped to /. 2. Negative values indicate instability. Table 4. Results of in-of-the-loop compensation for different load conditions in the case of a gain configuration of either - or + (R g = Ω and R f = kω) for TS57 =kω =kω =kω C L R () IL C IL Mg (2) Mϕ (2) R () IL C IL Mg (2) Mϕ (2) R () IL C IL Mg (2) Mϕ (2) (Ω) (pf) (db) (degree) (Ω) (pf) (db) (degree) (Ω) (pf) (db) (degree) nf nf nf R IL cells are shaded when its value is clamped to ( // R f )/. 2. Negative values indicate instability. In a gain configuration, when considering the loop gain, the output is loaded by a resistive load of // (R f + R g ), where R f and R g are the resistors used for the gain. If R f + R g <<, the loop gain and therefore the stability parameters are the same whatever the value of. This is visible in Table 4 where R f + R g =. kω with = kω and = kω.. 3/22

14 In-the-loop compensation method AN2653 Table 5. Table 5 and Table 6 help you to choose the best compensation components for different ranges of load capacitors (and with = kω) in voltage follower configuration and in a gain configuration of either - or +. However, each case of load can be improved by choosing specific components (seetable 3 and Table 4). Best compensation components for different load capacitor ranges in voltage follower configuration for TS57 (with = kω) Load capacitor range R IL (kω) C IL (pf) Table 6. Minimum gain margin (db) Minimum phase margin (degree) pf to pf pf to nf nf to nf nf to nf Best compensation components for different load capacitor ranges in a gain configuration of either - or + (R g = Ω and R f = kω) for TS57 (with = kω) Load capacitor range R IL (Ω) C IL (pf) Minimum gain margin (db) Minimum phase margin (degree) pf to pf pf to nf nf to nf nf to nf These tables are very valuable because almost all the follower and gain configuration applications requiring compensation have capacitive loads in the range of pf to nf. Thus, a simple combination of (R IL, C IL ), depending on can cover all these cases with a very good stability. The loop gain shown in Figure 23, plotted for a voltage follower configuration with C L = nf and = kω, shows the instability without compensation. This can also be observed in Figure 24 with the peaking present on closed loop. Both figures show the benefits of compensation. Figure 23. Loop gain Figure 24. Measured closed loop gain Gain (db) E-2 Voltage Follower Configuration - Loop Gain Compensation with the In-the-Loop Technique.E-.E+ Gain without Compensation Phase without Compensation.E+.E+2.E+3 Frequency (Hz).E+4.E+5 RL = kω CL = nf.e+6.e Phase ( ) Gain with RIL = kω and CIL = 47 pf Phase with RIL = kω and CIL = 47 pf Gain (db) E+3 Voltage Follower Configuration - Closed Loop Gain Compensation with the In-the-Loop Technique With In-the-Loop Compensation Technique.E+4 Gain without CL Without Compensation.E+5 Frequency (Hz).E+6 RL = kω CL = nf Gain with RIL = kω and CIL = 47 pf.e+7 4/22

15 In-the-loop compensation method The zero and the pole introduced by the compensation are visible on the loop gain. Introducing first the pole at = 2π ( R IL )( C IL + C L ) 25kHz leads to a gain fall (with a slope of -4 db/decade with compensation) which allows to come closer to unity gain. The zero, occurring at = 4kHz 2π R IL C IL leads to an upturn of the phase so that when unity gain is reached, the effect of the first poles are limited in terms of phase shifting. Thus, the circuit is stable with a good phase margin. Furthermore, it leads to an excellent gain margin, because the gain keeps falling whereas the phase increases due to the zero, before finally decreasing to reach the -8 point. 5/22

16 Snubber network compensation method AN Snubber network compensation method 5. Theoretical overview Figure 25 shows another way to stabilize an operational amplifier driving a capacitive load. The snubber network compensation method consists in adding an RC series circuit connected between the output and the ground. It is particularly recommended for lower voltage applications, where the full output swing is needed. Figure 25. Snubber network schematics Figure 26. Snubber network equivalent schematics for loop gain calculation Introducing a second load resistor R SN in the circuit decreases the resistive load, and as a result, pushes the pole caused by the capacitive load to higher frequencies, from π ( Z o )C L to π ( Z o R SN )C L Therefore, stability is increased. Furthermore, adding a serial capacitor C SN with R SN removes the impact of R SN in DC. On one hand, C SN must be big enough to consider that its impedance is small compared to R SN at the frequencies where R SN plays its role of stabilizer. On the other hand, R SN being very small, C SN must be small enough because when the frequency increases, the system becomes limited by the current flowing through R SN and C SN (depending on the output voltage swing). V I = R j SN C SN ω Therefore, in the following examples, C SN is limited to nf in order to not limit the frequency range. 6/22

17 Snubber network compensation method In fact, this compensation introduces a zero and an additional pole into the loop gain: V r V s = A( ω) ( + jr SN C SN ω) Z o Z + + jz o ( C L + C SN )ω+ j o RSN C SN ω Z o R SN C L C SN ω 2 Because Z o is not a pure resistance over frequency, choosing the minimum R SN is not always the best case. 5.2 Application on the TS57 For the TS57, according to the abacus in Figure 27 and Figure 28, this compensation method in the case of a voltage follower configuration, works only if the capacitive load is less than nf, in order to obtain (at least) a phase margin of 2. Figure 27. Gain margin abacus in a voltage follower configuration Figure 28. Phase margin abacus in a voltage follower configuration.e-6.e-7.e-8 Voltage Follower Configuration - Load Abacus Gain Margin UNSTABLE.E-6.E-7.E-8 Voltage Follower Configuration - Load Abacus Phase Margin UNSTABLE CL (F).E-9 CL (F).E-9.E-.E-.E- STABLE.E- STABLE.E-2.E+.E+.E+2.E+3.E+4.E+5.E+6.E+7 RL (Ω) db db 2 db 3 db.e-2.e+.e+.e+2.e+3.e+4.e+5.e+6.e+7 RL (Ω) C ( ) 2 C (3 ) 4 Figure 29 and Figure 3 are the same abacus in case of a gain of either - or +. Figure 29. Gain margin abacus in a gain configuration of either - or + Figure 3. Phase margin abacus in a gain configuration of either - or +.E-6.E-7 Gain Configuration of either - or + - Load Abacus Gain Margin UNSTABLE.E-6.E-7 Gain Configuration of either - or + - Load Abacus Phase Margin UNSTABLE.E-8.E-8 CL (F).E-9 CL (F).E-9.E-.E-.E- STABLE.E- STABLE.E-2.E+.E+.E+2.E+3.E+4.E+5.E+6.E+7 RL (Ω).E-2.E+.E+.E+2.E+3.E+4.E+5.E+6.E+7 RL (Ω) db db 2 db 3 db 4 db 5 db You can use the abacus in Figure 27 to Figure 3 to determine the best R SN value. 7/22

18 Snubber network compensation method AN2653 Table 7 to Table give the results of compensation in a follower configuration and several gain configurations for different load conditions. Table 7. Results of snubber network compensation for different load conditions in the case of a voltage follower configuration for TS57 =kω =kω =kω C L R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) nf nf Negative values indicate instability. Table 8. Results of snubber network compensation for different load conditions in the case of a gain configuration of either - or +2 (R f = R g = kω) for TS57 =kω =kω =kω C L R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) nf nf Negative values indicate instability. Table 9. Results of snubber network compensation for different load conditions in the case of a gain configuration of either - or + (R g = Ω and R f = kω) for TS57 =kω =kω =kω C L R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) nf nf nf Negative values indicate instability. 8/22

19 Snubber network compensation method Table. Results of snubber network compensation for different load conditions in the case of a gain configuration of either -3 or +3 (R g = Ω and R f = 3 kω) for TS57 =kω =kω =kω C L R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () R SN C SN Mg () Mϕ () (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) (Ω) (nf) (db) (degree) nf nf nf Negative values indicate instability. The results are almost the same whether = kω, kω or kω because in all cases, at the frequency range that has a significant impact on stability, the resistive load on the amplifier is R SN // R SN. From Table 7, you can see that, in the case of a voltage follower configuration, this compensation method doesn t work for capacitive loads higher than nf because C SN is limited to nf. Figure 27 and Figure 28 show that lower R SN values would give better results. However, in this case, these abacus are not valid because the C SN impedance is not negligible compared with R SN at the frequency range where R SN plays its role of stabilizer. For = kω and C L = nf, the snubber network compensation method gives the loop gain and closed loop gain shown in Figure 3 and Figure 32 respectively. Figure 3. Loop gain Figure 32. Measured closed loop gain Gain (db) E-2 Voltage Follower Configuration - Loop Gain Compensation with the Snubber Network Technique.E-.E+ Gain without Compensation Phase without Compensation.E+.E+2.E+3 Frequency (Hz).E+4.E+5 RL = kω CL = nf.e+6.e Phase ( ) Gain with RSN = 3 Ω and CSN = nf Phase with RSN = 3 Ω and CSN = nf Gain (db) E+3 Voltage Follower Configuration - Closed Loop Gain Compensation with the Snubber Network Technique With Snubber Network Compensation Technique.E+4 Gain without Compensation Without Compensation.E+5 Frequency (Hz).E+6 RL = kω CL = nf.e+7 Gain with RSN = 3 Ω and CSN = nf This compensation has the main advantage of neither reducing the output swing nor the gain accuracy, unlike the two other compensation methods. Nevertheless, for the TS57, this method is limited to capacitive loads lower than nf in a voltage follower configuration, and the stability improvement provided by the compensation is not as good as with the two other methods. 9/22

20 Conclusion AN Conclusion Based on the results of the three compensation methods described in this application note, it can be stated that the best compensation solution for the TS57 is the in-the-loop method. This is the most complex solution to understand, but a pick-up table is provided in order to choose the most appropriate components for your application. The main drawback of this compensation method is a limited output swing. The out-of-the-loop compensation method is easy to implement because it requires only one extra component. The way it works is also easy to understand. However, its main limitation is an inaccuracy on the output voltage because the load is part of a divider bridge. An abacus is provided to choose the component you need for your application. Finally, the snubber method is easy to understand and use. It does not have the drawbacks of the first two solutions. But because the loop gain cannot be considered as a pure thirdorder system (because of the open loop gain of the amplifier and the variations of the output impedance which is not purely resistive and constant over frequency), it does not lead to great improvements, and it is limited to load capacitors lower than nf in the case of the TS57. An abacus is also provided for this compensation method. Another drawback of this solution is that it potentially limits the frequency range of the application for large output signals due to a strong current flowing through the compensation elements. This compensation method is not really useful for the TS57. In conclusion, for the TS57, whenever possible, we recommend to use the in-the-loop compensation method. Note, that this document provides typical values for the TS57 at ambient temperature. Therefore, your chosen solution must in any case be checked on bench. 2/22

21 Revision history 7 Revision history Table. Document revision history Date Revision Changes 7-Nov-27 Initial release. 2/22

22 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. 27 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 22/22

### STEVAL-ILL032V1. Multicolor LED matrix demonstration board based on the STP24DP05BTR. Features. Description

STEVAL-ILL032V1 Multicolor LED matrix demonstration board based on the STP24DP05BTR Data brief Features 4 STP24DP05BTR drivers for each display panel 8 panels can be cascaded in series using a flat ribbon

### Obsolete Product(s) - Obsolete Product(s)

14 W hi-fi audio amplifier Features Wide-range supply voltage, up to 36 V Single or split power supply Short-circuit protection to ground Thermal shutdown Description The TDA2030 is a monolithic integrated

### BD238. Low voltage PNP power transistor. Features. Applications. Description. Low saturation voltage PNP transistor

Low voltage PNP power transistor Features Low saturation voltage PNP transistor Applications Audio, power linear and switching applications Description The device is manufactured in planar technology with

### ULN2801A, ULN2802A, ULN2803A, ULN2804A

ULN2801A, ULN2802A, ULN2803A, ULN2804A Eight Darlington array Datasheet production data Features Eight Darlington transistors with common emitters Output current to 500 ma Output voltage to 50 V Integral

### 2SD1047. High power NPN epitaxial planar bipolar transistor. Features. Application. Description

High power NPN epitaxial planar bipolar transistor Features High breakdown voltage V CEO = 140 V Typical f t = 20 MHz Fully characterized at 125 o C Application Power supply Description TO-3P The device

### STEVAL-ILL033V1. Master/slave control for multicolor LED matrix demonstration board based on the STM32F103VET6. Features.

Master/slave control for multicolor LED matrix demonstration board based on the STM32F103VET6 Data brief Features Control unit with PS2 keyboard interface for data entry Control unit with LCD which displays

### TIP142, TIP147. Complementary power Darlington transistors. Features. Applications. Description

Complementary power Darlington transistors Datasheet production data Features Monolithic Darlington configuration Integrated antiparallel collector-emitter diode Applications Linear and switching industrial

### AN2604 Application note

AN2604 Application note STM32F101xx and STM32F103xx RTC calibration Introduction The real-time clock (RTC) precision is a requirement in most embedded applications, but due to external environment temperature

### Obsolete Product(s) - Obsolete Product(s)

High power NPN epitaxial planar bipolar transistor Preliminary data Features High breakdown voltage V CEO = 230 V Typical f T = 30 MHz Application Audio power amplifier Description This device is a NPN

### BD241A BD241C. NPN power transistors. Features. Applications. Description. NPN transistors. Audio, general purpose switching and amplifier transistors

BD241A BD241C NPN power transistors Features. NPN transistors Applications Audio, general purpose switching and amplifier transistors Description The devices are manufactured in Planar technology with

### TN0023 Technical note

Technical note Discontinuous flyback transformer description and design parameters Introduction The following is a general description and basic design procedure for a discontinuous flyback transformer.

### 2STC2510. High power NPN epitaxial planar bipolar transistor. Features. Application. Description

High power NPN epitaxial planar bipolar transistor Features High breakdown voltage V CEO = 100 V Complementary to 2STA2510 Typical f t = 20 MHz Fully characterized at 125 o C Application Audio power amplifier

### DDSL01. Secondary protection for DSL lines. Features. Description

Secondary protection for DSL lines Features Stand off voltage: 30 V Surge capability: I pp = 30 A 8/20 µs Low capacitance device: 4.5 pf at 2 V RoHS package Low leakage current: 0.5 µa at 25 C 3 2 Description

### AN1489 Application note

Application note VIPower: non isolated power supply using VIPer20 with secondary regulation Introduction Output voltage regulation with adjustable feedback compensation loop is very simple when a VIPer

### MC33079. Low noise quad operational amplifier. Features. Description

Low noise quad operational amplifier Datasheet production data Features Low voltage noise: 4.5 nv/ Hz High gain bandwidth product: 15 MHz High slew rate: 7 V/µs Low distortion: 0.002% Large output voltage

### TIP41C TIP42C. Complementary power transistors. Features. Applications. Description

TIP41C TIP42C Complementary power transistors Features Complementary PNP-NPN devices New enhanced series High switching speed h FE grouping h FE improved linearity Applications General purpose circuits

### AN2669 Application note

Application note How to configure the STM8A microcontroller clocks Introduction The STM8A microcontroller has a very flexible clock controller (CLK) that allows the clocks to be reconfigured at any time

### AN2389 Application note

Application note An MCU-based low cost non-inverting buck-boost converter for battery chargers Introduction As the demand for rechargeable batteries increases, so does the demand for battery chargers.

### STP03D kv NPN Darlington transistor. Features. Application. Description (2, TAB) B (1) E (3)

2 kv NPN Darlington transistor Features Extra high voltage capability High gain characteristic TAB Application Active start-up network in 3 phase S.M.P.S. (see application note AN2454) Description The

### LM134-LM234-LM334. Three terminal adjustable current sources. Features. Description

Three terminal adjustable current sources Features Operates from 1V to 40V 0.02%/V current regulation Programmable from 1µA to 10mA ±3% initial accuracy Description The LM134/LM234/LM334 are 3-terminal

### STEVAL-CCM002V1. TFT-LCD panel demonstration board based on the STM32 as LCD controller. Features. Description

TFT-LCD panel demonstration board based on the STM32 as LCD controller Data brief Features Displays images on a TFT-LCD using the STM32 as LCD controller Includes a slideshow of images to demonstrate static

### L2293Q. Push-pull four channel driver with diodes. Features. Description

Push-pull four channel driver with diodes Features 600 ma output current capability per channel 1.2 A peak output current (non repetitive) per channel Enable facility Overtemperature protection Logical

### L78MxxAB L78MxxAC. Precision 500 ma regulators. Features. Description

L78MxxAB L78MxxAC Precision 500 ma regulators Features Output current to 0.5 A Output voltages of 5; 6; 8; 9; 10; 12; 15; 18; 24 V Thermal overload protection Short circuit protection Output transition

### BD135 - BD136 BD139 - BD140

BD135 - BD136 BD139 - BD140 Complementary low voltage transistor Features Products are pre-selected in DC current gain Application General purpose Description These epitaxial planar transistors are mounted

### AN3332 Application note

Application note Generating PWM signals using STM8S-DISCOVERY Application overview This application user manual provides a short description of how to use the Timer 2 peripheral (TIM2) to generate three

### TDE1747. Interface circuit - relay and lamp-driver. Features. Description. Order codes

Interface circuit - relay and lamp-driver Features Open ground protection High output current Adjustable short-circuit protection to ground Thermal protection with hysteresis to avoid the intermediate

### 2SD882. NPN medium power transistor. Features. Applications. Description. High current Low saturation voltage Complement to 2SB772

NPN medium power transistor Features High current Low saturation Complement to 2SB772 Applications Voltage regulation Relay driver Generic switch Audio power amplifier DC-DC converter Description The device

### EVL185W-LEDTV. 185 W power supply with PFC and standby supply for LED TV based on the L6564, L6599A and Viper27L. Features.

Features 185 W power supply with PFC and standby supply for LED TV based on the L6564, L6599A and Viper27L Data brief Universal input mains range: 90 264 Vac - frequency 45 65 Hz Output voltage 1: 130

### LM135-LM235-LM335. Precision temperature sensors. Features. Description

Precision temperature sensors Features Directly calibrated in K 1 C initial accuracy Operates from 450µA to 5mA Less than 1Ω dynamic impedance TO-92 (Plastic package) Description The LM135, LM235, LM335

### AN2866 Application note

Application note How to design a 13.56 MHz customized tag antenna Introduction RFID (radio-frequency identification) tags extract all of their power from the reader s field. The tags and reader s antennas

### Description. Table 1. Device summary

2 A positive voltage regulator IC Description Datasheet - production data Features TO-220 Output current up to 2 A Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V Thermal protection Short circuit protection

### AN3353 Application note

Application note IEC 61000-4-2 standard testing Introduction This Application note is addressed to technical engineers and designers to explain how STMicroelectronics protection devices are tested according

### TIP31C. Power transistors. General features. Applications. Description. Internal schematic diagram. Order codes

Power transistors General features New enhanced series High switching speed h FE improved linearity h FE Grouping Applications Linear and switching industrial application TO-220 1 2 3 Description The TIP31C

### UA741. General-purpose single operational amplifier. Features. Applications. Description. N DIP8 (plastic package)

General-purpose single operational amplifier Datasheet - production data N DIP8 (plastic package) D SO8 (plastic micropackage) Pin connections (top view) 1 - Offset null 1 2 - Inverting input 3 - Non-inverting

### 2STBN15D100. Low voltage NPN power Darlington transistor. Features. Application. Description

Low voltage NPN power Darlington transistor Features Good h FE linearity High f T frequency Monolithic Darlington configuration with integrated antiparallel collector-emitter diode TAB Application Linear

### LM337. Three-terminal adjustable negative voltage regulators. Features. Description

Three-terminal adjustable negative voltage regulators Datasheet - production data current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional

### DSL01-xxxSC5. Secondary protection for DSL lines. Features. Description. Applications. Benefits. Complies with the following standards

-xxxsc5 Secondary protection for DSL lines Features Low capacitance devices: -xxxsc5: Delta C typ = 3.5 pf High surge capability: 30 A - 8/20 µs Voltage: 8 V, 10.5 V, 16 V, and 24 V RoHS package Benefits

### ULN2001, ULN2002 ULN2003, ULN2004

ULN2001, ULN2002 ULN2003, ULN2004 Seven Darlington array Datasheet production data Features Seven Darlingtons per package Output current 500 ma per driver (600 ma peak) Output voltage 50 V Integrated suppression

### BZW50. Transil, transient voltage surge suppressor (TVS) Features. Description

Transil, transient voltage surge suppressor (TVS) Datasheet production data Features Peak pulse power: 5000 W (10/0 µs) Stand-off voltage range from 10 V to 180 V Unidirectional and bidirectional types

### Table 1. Absolute maximum ratings (T amb = 25 C) Symbol Parameter Value Unit. ISO 10605 - C = 330 pf, R = 330 Ω : Contact discharge Air discharge

Automotive dual-line Transil, transient voltage suppressor (TVS) for CAN bus Datasheet - production data Complies with the following standards ISO 10605 - C = 150 pf, R = 330 Ω : 30 kv (air discharge)

### ST13005. High voltage fast-switching NPN power transistor. Features. Applications. Description

High voltage fast-switching NPN power transistor Datasheet production data Features Low spread of dynamic parameters Minimum lot-to-lot spread for reliable operation Very high switching speed Applications

### Single LNB supply and control IC DiSEqC 1.X compliant with EXTM based on the LNBH29 in a QFN16 (4x4) Description

Single LNB supply and control IC DiSEqC 1.X compliant with EXTM based on the LNBH29 in a QFN16 (4x4) Data brief Low-drop post regulator and high-efficiency step-up PWM with integrated power N-MOS allowing

### AN4368 Application note

Application note Signal conditioning for pyroelectric passive infrared (PIR) sensors Sylvain Colliard-Piraud Introduction Pyroelectric passive infrared (PIR) sensors are widely used in daily life. They

### Main components Offline high voltage converter Advanced constant voltage and constant current controller

DN0002 Design note 10W offline LED driver based on VIPER27 Designs from our labs describe tested circuit designs from ST labs which provide optimized solutions for specific applications. For more information

### AN4451 Application note

Application note Signal conditioning for a UV sensor Nicolas Aupetit Introduction This application note describes the analog conditioning circuit used for a high impedance sensor that acts like a current

### TDA2003 10W CAR RADIO AUDIO AMPLIFIER

TDA2003 10W CAR RADIO AUDIO AMPLIFIER DESCRIPTION The TDA 2003 has improved performance with the same pin configuration as the TDA 2002. The additional features of TDA 2002, very low number of external

### STLD40D. White LED power supply for large display backlight. Features. Applications. Description

White LED power supply for large display backlight Features Inductor switches boost controller PFM mode control High efficiency over wide range of input voltage from 3.0 V to 5.5 V Over voltage protection

### AN3110 Application note

Application note Using the STVM100 to automatically adjust VCOM voltage in e-paper Introduction The widespread use of multimedia electronic devices, coupled with environmental concerns over the manufacturing

### L6234. Three phase motor driver. Features. Description

Three phase motor driver Features Supply voltage from 7 to 52 V 5 A peak current R DSon 0.3 Ω typ. value at 25 C Cross conduction protection TTL compatible driver Operating frequency up to 150 khz Thermal

### DIP1524-01D3. GPS/GLONASS and 2.4 GHz diplexer. Features. Applications. Description

GPS/GLONASS and 2.4 GHz diplexer Datasheet production data Features Low insertion loss High attenuation levels Input power for GPS: 25 dbm max Input power for WLAN: 28 dbm max High power capacity Lead-free,

### AN2680 Application note

Application note Fan speed controller based on STDS75 or STLM75 digital temperature sensor and ST72651AR6 MCU Introduction This application note describes the method of defining the system for regulating

### AN3998 Application note

Application note PDM audio software decoding on STM32 microcontrollers 1 Introduction This application note presents the algorithms and architecture of an optimized software implementation for PDM signal

### Description. Table 1. Device summary SOT-223 DPAK TO-220

Low drop fixed and adjustable positive voltage regulators Datasheet - production data SOT-223 Available in ± 2% (at 25 C) and 4% in full temperature range High supply voltage rejection: 80 db typ. (at

### Description. Table 1. Device summary. Order code Temperature range Package Packaging Marking

14-stage ripple carry binary counter/divider and oscillator Applications Automotive Industrial Computer Consumer Description Datasheet - production data Features Medium speed operation Common reset Fully

### Order code Temperature range Package Packaging

ST485B ST485C Low power RS-485/RS-422 transceiver Features Low quiescent current: 300 µa Designed for RS-485 interface application - 7 V to 12 V common mode input voltage range Driver maintains high impedance

### AN2986 Application note

Application note AC switch triggering with 3.3 V power supply Introduction This document focuses on the calculation of gate current consumption of various types of AC switches when using a 3.3 V power

### EN: This Datasheet is presented by the m anufacturer. Please v isit our website for pricing and availability at www.hest ore.hu.

EN: This Datasheet is presented by the m anufacturer. Please v isit our website for pricing and availability at www.hest ore.hu. 2N3055, MJ2955 Complementary power transistors Features Datasheet - production

### AN4046 Application note

Application note EnFilm micro battery EFL700A39 recommendations for manual assembly on PCB Introduction This document provides recommendations to manually mount EnFilm TM micro battery EFL700A39 on printed

### Description. Table 1. Device summary. Order codes. TO-220 (single gauge) TO-220 (double gauge) D²PAK (tape and reel) TO-220FP

1.2 V to 37 V adjustable voltage regulators Description Datasheet - production data TO-220 TO-220FP The LM217, LM317 are monolithic integrated circuits in TO-220, TO-220FP and D²PAK packages intended for

### ETP01-xx21. Protection for Ethernet lines. Features. Description. Applications. Benefits. Complies with the following standards

ETP0-xx2 Protection for Ethernet lines Features Differential and common mode protection Telcordia GR089 Intrabuilding: 50 A, 2/0 µs ITU-T K20/2: 40 A, 5/30 µs Low capacitance: 3 pf max at 0 V UL94 V0 approved

### UM1513 User manual. STEVAL-ILD003V2: SCR dimmer, US version. Introduction

User manual STEVAL-ILD003V2: SCR dimmer, US version Introduction The purpose of this board is to allow the user to evaluate the STEVAL-ILD003V2 SCR dimmer solution for low-consumption lamps, particularly

### Description. Table 1. Device summary. Order code Temperature range Package Packing Marking

Hex buffer/converter (non-inverting) Applications Datasheet - production data Features SO16 Propagation delay time t PD = 50 ns (typ.) at V DD = 10 V, C L = 50 pf High to low level logic conversion Multiplexer:

### Micropower 1 A synchronous step-up DC-DC converter

DN0010 Design note Adapting ST power line modem evaluation boards to communicate over a DC bus Designs from our labs describe tested circuit designs from ST labs which provide optimized solutions for specific

### STP60NF06. N-channel 60V - 0.014Ω - 60A TO-220 STripFET II Power MOSFET. General features. Description. Internal schematic diagram.

N-channel 60V - 0.014Ω - 60A TO-220 STripFET II Power MOSFET General features Type V DSS R DS(on) I D STP60NF06 60V

### AN4275 Application note

Application note IEC 61000-4-5 standard overview Introduction The objective of this document is to briefly explain the IEC 61000-4-5 standards and to show the benefits of having a range of protection devices

### AN4108 Application note

Application note How to set up a HTTPS server for In-Home display with HTTPS Introduction This application note describes how to configure a simple SSL web server using the EasyPHP free application to

### STP60NF06FP. N-channel 60V - 0.014Ω - 30A TO-220FP STripFET II Power MOSFET. General features. Description. Internal schematic diagram.

N-channel 60V - 0.014Ω - 30A TO-220FP STripFET II Power MOSFET General features Type V DSS R DS(on) I D STP60NF06FP 60V

### STV0900. Multistandard advanced dual demodulator for Satellite Digital TV and Data services set-top boxes. Description. Features

Multistandard advanced dual demodulator for Satellite Digital TV and Data services set-top boxes Data Brief Description The features a high speed DVB-S2 Forward Error Corrector (FEC) which is designed

### Main components Current Controller For Stepping Motors High-voltage half bridge driver

DN000 Design note A high power stepper motor driver Designs from our labs describe tested circuit designs from ST labs which provide optimized solutions for specific applications. For more information

### STN3NF06L. N-channel 60 V, 0.07 Ω, 4 A, SOT-223 STripFET II Power MOSFET. Features. Application. Description

N-channel 60 V, 0.07 Ω, 4 A, SOT-223 STripFET II Power MOSFET Features Type V DSS (@Tjmax) Exceptional dv/dt capability Avalanche rugged technology 100% avalanche tested R DS(on) max STN3NF06L 60 V < 0.1

PRODUCT TERMINATION NOTIFICATION PTN APM-MHD/11/6262 Notification Date 02/03/2011 TERMINATION OF ALL NVRAM HYBRIDS 1/5 Table 1. Termination Implementation Schedule Forecasted date of STMicroelectronics

### Obsolete Product(s) - Obsolete Product(s)

25watt hifi audio power amplifier Datasheet production data Features Widerange supply voltage, up to 40 V Single or split power supply Shortcircuit protection to ground Thermal shutdown P O = 25 W @ THD

### ESDLIN1524BJ. Transil, transient voltage surge suppressor diode for ESD protection. Features. Description SOD323

Transil, transient voltage surge suppressor diode for ESD protection Datasheet production data Features Max peak pulse power 160 W (8/0 µs) Asymmetrical bidirectional device Stand-off voltage: 15 and 4

### STPS40L15C. Low drop OR-ing power Schottky diode. Features. Description

Low drop OR-ing power Schottky diode Features Very low forward voltage drop for less power dissipation and reduced heatsink size A K Reverse voltage suited to OR-ing of 3 V, 5 V and 2 V rails A2 Avalanche

### Description. Order codes

Negative voltage regulators TO-220 Features Description Output current up to 1.5 A Output voltages of - 5; - 8; - 12; - 15 V Thermal overload protection Short circuit protection Output transition SOA protection

### STV9325. Vertical deflection booster for 2.5 App TV/monitor applications with 70 V flyback generator. Features. Description STV9325.

Vertical deflection booster for 2.5 App TV/monitor applications with 0 V flyback generator Features Power amplifier Flyback generator Stand-by control Output current up to 2.5 App Thermal protection Description

### Features. Description. Table 1. Device summary. Order code Package Branding STAC STAC265B May 2014 DocID Rev 4 1/13

LDMOS L-band radar transistor Features Datasheet - preliminary data Excellent thermal stability Common source configuration push-pull P OUT = 250 W with 14 db gain over 1200-1400 MHz ST air cavity / STAC

### AN2590 Application note

Application note 20 W dimmable CFL ballast solution Introduction This application note describes the 20 W dimmable CFL ballast solution which can completely replace incandescent lamps in formal dimming

### High gain Low V CE(sat) Simplified circuit design Reduced component count SO-8. Part Number Marking Package Packing

Dual NPN-PNP complementary Bipolar General features CE(sat) h FE I C 0.35 >100 1A High gain Low CE(sat) Simplified circuit design Reduced component count SO-8 Applications Push-Pull or Totem-Pole configuration

### AN3116 Application note

Application note STM32 s ADC modes and their applications Introduction STM32 microcontrollers have one of the most advanced ADCs on the microcontroller market. You could imagine a multitude of applications

### TDA2004R. 10 + 10 W stereo amplifier for car radio. Features. Description

10 + 10 W stereo amplifier for car radio Features Low distortion Low noise Protection against: Output AC short circuit to ground Overrating chip temperature Load dump voltage surge Fortuitous open ground

### SPC5-FLASHER. Flash management tool for SPC56xx family. Description. Features

Flash management tool for SPC56xx family Data brief Flash verify: check the Flash content with a binary image file Unsecure sequence for censored device: sending the private password selected from the

### Description. Table 1. Device summary. Order codes Temperature range Package Packaging

Features DIP-8 ESD protection ±15 kv human body model ±8 kv IEC 1000-4-2 contact discharge Operates from a single 3.3 V supply - no charge pump required Interoperable with 5 V logic 1 µa low current shutdown

### P6KE. Transil, transient voltage surge suppressor (TVS) Features. Description. Complies with the following standards

Transil, transient voltage surge suppressor (TVS) Datasheet production data Features Peak pulse power: 600 W (10/0 µs ) Stand-off voltage range 6.8 to 440 V Unidirectional and bidirectional types Low clamping

### AN2703 Application note

Application note list for SCRs, TRIACs, AC switches, and DIACS Introduction All datasheet parameters are rated as minimum or maximum values, corresponding to the product parameter distribution. In each

### AN4156 Application note

Application note Hardware abstraction layer for Android Introduction This application note provides guidelines for successfully integrating STMicroelectronics sensors (accelerometer, magnetometer, gyroscope

### AN2760 Application note

Application note Using clock distribution circuits in smart phone system design Introduction As smart phones become more and more popular in the market, additional features such as A-GPS, Bluetooth, WLAN

### TDA7384A. 4 x 46 W quad bridge car radio amplifier. Features. Description

4 x 46 W quad bridge car radio amplifier Datasheet production data Features High output power capability: 4 x 46 W / 4 max. 4 x 27 W / 4 @ 14.4 V, 1 khz, 10 % Low distortion Low output noise Standby function

### Description. Order code Temperature range Package Packing Marking

Dual D-type flip-flop PDIP14 SO14 Applications Automotive Industrial Computer Consumer Datasheet - production data Features Description Set-reset capability Static flip-flop operation - retains state indefinitely

### AN3265 Application note

Application note Handling hardware and software failures with the STM8S-DISCOVERY Application overview This application is based on the STM8S-DISCOVERY. It demonstrates how to use the STM8S window watchdog

### Description SO-8. series. Furthermore, in the 8-pin configuration Very low-dropout voltage (0.2 V typ.)

ery low-dropout voltage regulator with inhibit function TO-92 Bag TO-92 Tape and reel Ammopack 1 2 3 SO-8 Description Datasheet - production data The is a very low-dropout voltage regulator available in

### AN3359 Application note

Application note Low cost PCB antenna for 2.4GHz radio: Meander design 1 Introduction This application note is dedicated to the STM32W108 product family from STMicroelectronics. One of the main reasons

### BTA A Snubberless Triacs. Features. Description. I T(RMS) = 20 A V DRM, V RRM = 600 and 700 V I GT (Q1) (max) = 35 and 50 ma

20 A Snubberless Triacs Datasheet production data Features I T(RMS) = 20 A V DRM, V RRM = 600 and 700 V I GT (Q1) (max) = 35 and 50 ma Description G A2 A1 The BTA20 Triacs use high performance glass passivated

### AN2863 Application note

Application note Smart inductive proximity switch with SPT01-335DEE 1 Introduction The STEVAL-IFS006V2 demonstration board shows an inductive proximity switch based on the principle of metal body detection

### STM1061. Low Power Voltage Detector. Features

Low Power Voltage Detector Features Factory-trimmed Voltage Thresholds in 0.1V Increments from 1.6 to 5.5V ±2% Voltage Threshold Accuracy Operating Voltage 0.7 to 6.0V Open Drain Output Low Supply Current

### TN0559 Technical note

Technical note Installing the SPEAr Linux Support Package (LSP 2.3.2) Introduction The SPEAr Linux Support Package (LSP 2.3.2) provides all the host-side (PC) and targetside (evaluation board) software

### AN4390 Application note

Application note ST s MOSFET technologies for uninterruptible power supplies Introduction The UPS (uninterruptible power supply) is gaining ever increasing importance in office and industrial environments,

### OSPlus TCP/IP Extension

Extension TCP/IP extension for OSPlus Data brief Application VFS FAT Ext2 LVM Device layer Device drivers TCP/IP stack NexGenOS NexGenIP NexGenRemote NexGenResolve NexGenBoot NexGenPPP USB stack OSPlus