TDA W DUAL BRIDGE AMPLIFIER
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1 TDA797 55W DUAL BRIDGE AMPLIFIER WIDE SUPPLY VOLTAGE RANGE (6V V) MINIMUM EXTERNAL COMPONENTS NO SVR CAPACITOR NO BOOTSTRAP NO BOUCHEROT CELLS INTERNALLY FIXED GAIN STANDBY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION TECHNOLOGY BI0II Multiwatt 5 DESCRIPTION The TDA797 is a dual bridge amplifier specially designed for TV and Portable Radio applications. ORDERING NUMBER: TDA797 BLOCK AND APPLICATION DIAGRAM V CC IN 0.µF 3 3 OUT 70µF 0nF STBY 7 IN 0.µF SGND 9 Vref 5 OUT OUT MUTE 6 PWGND OUT D9AU75B September 003 /9
2 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V S Supply Voltage 0 V I O Output Peak Current (internally limited) A P tot Total Power Dissipation (T case = 70 C) 33 W T op Operating Temperature 0 to 70 C T stg, T j Storage and Junction Temperature 0 to 50 C THERMAL DATA Symbol Description Value Unit R th jcase Thermal Resistance Junction to case Typ.. Max. C/W PIN CONNECTION (Top view) OUT OUT VCC IN N.C. N.C. SGND PWGND STBY MUTE N.C. IN V CC OUT OUT D95AU6 ELECTRICAL CHARACTERISTICS (VCC = 6.5V, RL = Ω, f = khz, Tamb = 5 C unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit V CC Supply Range 6.5 V I q Total Quiescent Current R L = ma V OS Output Offset Voltage 0 mv P O Output Power THD = % 3 5 W THD Total Harmonic Distortion P O = W % P O = 0.W to 5W f = 0Hz to 5kHz % SVR Supply Voltage Rejection f = 0Hz V R = 0.5V 0 56 db CT Crosstalk 6 60 db A MUTE Mute Attenuation 60 0 db T W Thermal Threshold 50 C G V Closed Loop Voltage Gain db Gv Voltage Gain Matching 0.5 db R i Input Resistance 5 30 KΩ /9
3 ELECTRICAL CHARACTERISTICS (Continued) Symbol Parameter Test Condition Min. Typ. Max. Unit VT MUTE Mute Threshold V O = 30dB.3.9. V VT STBY Stby Threshold V I STBY STBY current V6 = GND 0 µa e N Total Output Noise Voltage A curve f = 0Hz to 0kHz µv µv APPLICATION SUGGESTION STANDBY AND MUTE FUNCTIONS (A) Microprocessor Application In order to avoid annoying "PopNoise" during TurnOn/Off transients, it is necessary to guarantee the right Stby and mute signals sequence. It is quite simple to obtain this function using a microprocessor (Fig. and ). At first Stby signal (from mp) goes high and the voltage across the Stby terminal (Pin 7) starts to increase exponentially. The external RC network is intended to turnon slowly the biasing circuits of Figure : Microprocessor Application the amplifier, this to avoid "POP" and "CLICK" on the outputs. When this voltage reaches the Stby threshold level, the amplifier is switchedon and the external capacitors in series to the input terminals (C3, C5) start to charge. It s necessary to mantain the mute signal low until the capacitors are fully charged, this to avoid that the device goes in play mode causing a loud "Pop Noise" on the speakers. A delay of 000ms between Stby and mute signals is suitable for a proper operation. V CC IN C 0.µF 3 3 C5 70µF OUT C6 0nF STBY R K 7 C µf µp SGND 9 IN C3 0.µF Vref 5 OUT OUT MUTE R K 6 C µf PWGND OUT D95AU5A 3/9
4 Figure : Microprocessor Driving Signals. V S (V) V IN (mv) V STBY pin V MUTE pin I q (ma) V OUT (V) OFF STBY MUTE PLAY MUTE STBY OFF D96AU59 (B) Low Cost Application In low cost applications where the mp is not present, the suggested circuit is shown in fig.3. The Stby and mute terminals are tied together and they are connected to the supply line via an external voltage divider. The device is switchedon/off from the supply line and the external capacitor C is intended to delay the Stby and mute threshold exceeding, avoiding "Popping" problems. /9
5 Figure 3: Standalone Lowcost Application. VCC R 7K IN C3 0.µF STBY C 70µF OUT C 0nF R 7K C µf SGND 9 IN C5 0.µF Vref 5 OUT OUT MUTE 6 PWGND OUT D95AU60A Figure 3b: PCB and Component Layout of the Application Circuit (Fig. ). 5/9
6 Figure : Distortion vs Output Power Figure 5: Distortion vs Output Power THD(%) THD(%) Vcc = 6.5V Rl = ohm Vcc = V Rl = ohm f = 5KHz f = 5KHz 0. f = 5KHz 0. f = 5KHz f = KHz f = KHz Pout (W) Pout (W) Figure 6: Distortion vs Frequency Figure 7: Frequency Respone THD(%) Level(dBr) Vcc = 6.5V Rl = ohm Vcc = 6.5V Rl = ohm Pout = W Pout = 0mW Pout = 5W k k 0k frequency (Hz) k k 0k frequency (Hz) Figure : Output Power vs Supply Voltage Po(W) Rl = ohm f = KHz d = % d = % Vs(V) Figure 9: Total Power Dissipation & Efficiency vs Output Power Ptot(W) µ(%) P tot µ Vcc = 6.5V 35 6 Rl = ohm (both channels) f = KHz XPout(W) 6/9
7 Figure : Mute Attenuation vs. V pin.6 Figure : StandBy Attenuation vs Vpin.7 Attenuation (db) Vpin.6(V) Attenuation (db) Vpin.7 (V) Figure : Quiscent Current vs. Supply Voltage Iq (ma) Vsupply(V) 7/9
8 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C D E F G G H H L L L L L L M M S S Dia OUTLINE AND MECHANICAL DATA Multiwatt5 V /9
9 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners 003 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 9/9
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