NTE923 & NTE923D Integrated Circuit Precision Voltage Regulator

Transcription

1 NTE923 & NTE923D Integrated Circuit Precision Voltage Regulator Description: The NTE923 and NTE923D are voltage regulators designed primarily for series regulator applications. By themselves, these devices will supply output currents up to 150mA; but, external transistors can be added to provide any desired load current. The circuits feature extremely low standby current drain, and provision is made for either linear or foldback current limiting. These devices are also useful in a wide range of other applications such as shunt regulators, current regulators, and temperature controllers. Features: 150mA Current without External Pass Transistor Currents in Excess of 10A Possible by Adding External Transistors Input Voltage: 40V Max Voltage Adjustable from 2V to 37V Can be Used as Either a Linear or a Switching Regulator Absolute Maximum Ratings: Pulse Voltage from V+ to (50ms) V Continuous Voltage from V+ to V Input Voltage Differential V Maximum Amplifier Input Voltage Either Input V Differential V Current from mA Current from mA Internal Power Dissipation NTE mW NTE923D mW Operating Temperature Range to +70 C Storage Temperature Range NTE to +150 C NTE923D to +150 C Lead Temperature (During Soldering, 4sec max) NTE C NTE923D C

2 Electrical Characteristics: (Note 1) Parameter Test Conditions Min Typ Max Unit Line Regulation = 12V to 15V % 0 T A +70 C 0.3 % = 12V to 40V % Load Regulation I L = 1mA to 50mA % 0 T A +70 C 0.6 % Ripple Rejection f = 50Hz to 10kHz C REF = 0 74 db Average Temperature Coefficient of Voltage C REF = 5µF 86 db 0 T A +70 C, Note %/ C Short Circuit Current Limit = 10Ω, = 0 65 ma Reference Voltage V Noise Voltage BW = 100Hz to 10kHz C REF = 0 86 µv rms C REF = 5µF 2.5 µv rms Long Term Stability 0.05 %/1000Hrs Standby Current Drain I L = 0, = 30V ma Input Voltage Range V Voltage Range V Input Voltage Differential V Thermal Resistance, Junction to Ambient NTE923D 105 C/W NTE923 Board mount in still air 225 C/W Board mount in 400LF/Min Air flow 90 C/W Thermal Resistance, Junction to Case 25 C/W Note 1. Unless otherwise otherwise specified, T A = +25 C, = V+ = V C = 12V, = 0, = 5V, I L = 1mA, = 0, C! =, C REF = 0 and divider impedance as seen by error amplifier 10kΩ. Line and load regulation specifications are given for the condition of constant chip temperature. Temperature drifts must be taken into account separately for high dissipation conditions. Note 2. Guaranteed by correlation to other tests. Note 3. For metal can applications where is required, an external 6.2V zener diode should be connected in series with. NTE923 (Top View) Pin Connection Diagram NTE923D V (+) V C V out 7 6 V ( )/Case 8 5 N.C. 1 Current Limit 2 Current Sense N.C. Freq Comp V (+) Freq Comp 9 4 V ref Invert Input 4 11 V C Current Limit 10 1 Current Sense 3 Non Invert Input 2 Invert Input Non Invert Input V ref V ( ) V out N.C.

3 TABLE 1. Resistor Values (k ) for Standard Voltage: Fixed 5% Adjustable 10% (Note 5) Applicable Figures Voltage (Note 4) P1 Fixed 5% Adjustable 10% (Note 5) Applicable Figures Voltage (Note 4) P , 5, 6, 9, 12 (4) , 5, 6, 9, 12 (4) , 5, 6, 9, 12 (4) (Note 6) 3, (10) , 5, 6, 9, 12 (4) , , 4, (5, 6, 9, 12) , , 4, (5, 6, 9, 12) , , 4, (5, 6, 9, 12) , , 4, (5, 6, 9, 12) Note 4. Figures in parentheses may be used if / divider is placed on opposite input of error amp. Note 5. Replace / in figures with divider shown in Figure. Note 6. V+ and V CC must be connected to a +3V or greater supply. TABLE 2. Formulae for Intermediate Voltages: s from +2 to +7 Volts (Figures 1, 4, 5, 6, 9, 12) = ( x + ) s from +4 to +250 Volts (Figure 7) V = ( REF x 2 ); = Current Limiting I LIMIT = V SENSE s from +7 to +37 Volts (Figures 2, 4, 5, 6, 9, 12) + =( = x ) s from 6 to 250 Volts (Figures 3, 8, 10) V = ( REF + x 2 ); = Typical Applications: (Pin numbers relative to the plastic package) Foldback Current Limiting V I KNEE = OUT + V SENSE ( + ) V + I SHORT CKT = ( SENSE x ) ( ) Figure 1. Basic Low Voltage Regultor ( = 2 to 7 Volts) Figure 2. Basic High Voltage Regultor ( = 27to 37 Volts) C REF x Note: = + for minimum temperature drift. x Note: = + for minimum temperature drift. may be eliminated for minimum component count. Regulated Voltage Line Regulation ( = 3V) Load Regulation ( I L = 50mA) 5V 1.5mV Regulated Voltage Line Regulation ( = 3V) Load Regulation ( I L = 50mA) 15V 1.5mV 4.5mV

4 Figure 3. Negative Voltage Regultor Figure 4. Positive Voltage Regultor (External NPN Pass Transistor) R5 2K NTE218 NTE175 Regulated Voltage Line Regulation ( = 3V) Load Regulation ( I L = 100mA) 15V 1mV 2mV Regulated Voltage +15V Line Regulation ( = 3V) 1.5mV Load Regulation ( I L = 1A) 15mV Figure 5. Positive Voltage Regultor (External PNP Pass Transistor) Figure 6. Foldback Current Limiting 60 NTE K 5.6K 1nF 1nF Regulated Voltage +5V Line Regulation ( = 3V) Load Regulation ( I L = 1A) 5mV Regulated Voltage +5V Line Regulation ( = 3V) Load Regulation ( I L = 10mA) 1mV Short Circuit Current 20mA Figure 7. Positive Floating Regultor Figure 8. Negative Floating Regultor R5 200 R5 10K 10K D1 36V NTE5204A 3.0K NTE130 1Ω D1 12V NTE142A 2N K Regulated Voltage +50V Line Regulation ( = 20V) 30mV Load Regulation ( I L = 100mA) 20mV Regulated Voltage Line Regulation ( = 20V) Load Regulation ( I L = 100mA) 100V 30mV 20mV

5 Figure 9. Positive Switching Regultor Figure 10. Negative Switching Regultor R5 100 T2 2N5153 R K 51 NTE129 D1 NTE116 L1 1.2mH C2 100µF 0.1µF 1K 1K 220 NTE129 T2 NTE196 L1 1.2mH D1 NTE µF 1M 1M 15pF C2 100µF Regulated Voltage +5V Line Regulation ( = 30V) 10mV Load Regulation ( I L = 2A) 80mV Regulated Voltage Line Regulation ( = 20V) Load Regulation ( I L = 2A) 15V 8mV 6mV Figure 11. Remote Shutdown Regulator with Current Limiting Figure 12. Shunt Regulator 100 2K NTE123A 1nF 2K LOGIC INPUT 5nF 100 NTE175 Regulated Voltage +5V Line Regulation ( = 3V) Load Regulation ( I L = 50mA) 1.5mV Regulated Voltage +5V Line Regulation ( = 10V) Load Regulation ( I L = 100mA) 1.5mV Figure 13. Voltage Adjust (Note 6) P1 NON ERTING INPUT

6 NTE (8.52) Dia Max.260 (6.6) Max.500 (12.7) Min.018 (0.45) Dia Typ (2.92).370 (9.4) Max.230 (5.84) Dia 14 8 NTE923D (19.95) Max.300 (7.62).200 (5.08) Max.100 (2.45).099 (2.5) Min.600 (15.24)