LM723 LM723C Voltage Regulator
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- Dustin Day
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1 LM723 LM723C Voltage Regulator General Description The LM723 LM723C is a voltage regulator designed primarily for series regulator applications By itself it will supply output currents up to 150 ma but external transistors can be added to provide any desired load current The circuit features extremely low standby current drain and provision is made for either linear or foldback current limiting The LM723 LM723C is also useful in a wide range of other applications such as a shunt regulator a current regulator or a temperature controller The LM723C is identical to the LM723 except that the LM723C has its performance guaranteed over a 0 C to a70 C temperature range instead of b55 C toa125 C Connection Diagrams Dual-In-Line Package Features Y Y Y Y Y December ma output current without external pass transistor Output currents in excess of 10A possible by adding external transistors Input voltage 40V max Output voltage adjustable from 2V to 37V Can be used as either a linear or a switching regulator Metal Can Package LM723 LM723C Voltage Regulator TL H Top View Order Number LM723J 883 or LM723CN See NS Package J14A or N14A TL H Note Pin 5 connected to case Top View Order Number LM723H LM723H 883 or LM723CH See NS Package H10C Equivalent Circuit TL H Top View Order Number LM723E 883 See NS Package E20A Pin numbers refer to metal can package TL H C1995 National Semiconductor Corporation TL H 8563 RRD-B30M115 Printed in U S A
2 Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications (Note 9) Pulse Voltage from V a to V b (50 ms) Continuous Voltage from V a to V b Input-Output Voltage Differential Maximum Amplifier Input Voltage (Either Input) Maximum Amplifier Input Voltage (Differential) Current from V Z Current from V REF 50V 40V 40V 8 5V 5V 25 ma 15 ma Internal Power Dissipation Metal Can (Note 1) 800 mw Cavity DIP (Note 1) 900 mw Molded DIP (Note 1) 660 mw Operating Temperature Range LM723 b55 Ctoa150 C LM723C 0 Ctoa70 C Storage Temperature Range Metal Can b65 Ctoa150 C Molded DIP b55 Ctoa150 C Lead Temperature (Soldering 4 sec max ) Hermetic Package 300 C Plastic Package 260 C ESD Tolerance 1200V (Human body model 1 5 kx in series with 100 pf) Electrical Characteristics (Notes 2 9) Parameter Conditions LM723 LM723C Min Typ Max Min Typ Max Units Line Regulation V IN e 12V to V IN e 15V % V OUT b55 C s T A s a125 C 0 3 % V OUT 0 C s T A s a70 C 0 3 % V OUT V IN e 12V to V IN e 40V % V OUT Load Regulation I L e 1mAtoI L e50 ma % V OUT b55 C s T A s a125 C 0 6 % V OUT 0 C s T A s a70 C 0 6 % V OUT Ripple Rejection f e 50 Hz to 10 khz C REF e db f e 50 Hz to 10 khz C REF e 5 mf db Average Temperature Coeffic- b55 C s T A s a125 C % C ient of Output Voltage (Note 8) 0 C s T A s a70 C % C Short Circuit Current Limit R SC e 10X V OUT e ma Reference Voltage V Output Noise Voltage BW e 100 Hz to 10 khz C REF e mvrms BW e 100 Hz to 10 khz C REF e 5 mf mvrms Long Term Stability % 1000 hrs Standby Current Drain I L e 0 V IN e 30V ma Input Voltage Range V Output Voltage Range V Input-Output Voltage Differential V i JA Molded DIP 105 C W i JA Cavity DIP 150 C W i JA H10C Board Mount in Still Air C W i JA H10C Board Mount in 400 LF Min Air Flow C W i JC C W Note 1 See derating curves for maximum power rating above 25 C Note 2 Unless otherwise specified T A e 25 C V IN e V a e V C e 12V V b e 0 V OUT e 5V I L e 1 ma R SC e 0 C 1 e 100 pf C REF e 0 and divider impedance as seen by error amplifier s 10 kx connected as shown in Figure 1 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 3 L 1 is 40 turns of No 20 enameled copper wire wound on Ferroxcube P B7 pot core or equivalent with in air gap Note 4 Figures in parentheses may be used if R1 R2 divider is placed on opposite input of error amp Note 5 Replace R1 R2 in figures with divider shown in Figure 13 Note 6 V a and V CC must be connected to a a3v or greater supply Note 7 For metal can applications where V Z is required an external 6 2V zener diode should be connected in series with V OUT Note 8 Guaranteed by correlation to other tests Note 9 A military RETS specification is available on request At the time of printing the LM723 RETS specification complied with the Min and Max limits in this table The LM723E H and J may also be procured as a Standard Military Drawing 2
3 Characteristics Load Regulation Characteristics with Current Limiting Load Regulation Characteristics with Current Limiting Load Line Regulation vs Input-Output Voltage Differential Current Limiting Characteristics Current Limiting Characteristics vs Junction Temperature Standby Current Drain vs Input Voltage Output Impedence vs Line Transient Response Load Transient Response Frequency TL H Noise vs Filter Capacitor (C REF in Circuit of Figure 1 ) (Bandwidth 100 Hz to 10 khz) Maximum Power Ratings LM723 LM723C Power Dissipation vs Power Dissipation vs Ambient Temperature Ambient Temperature TL H
4 TABLE I Resistor Values (kx) for Standard Output Voltage Fixed Output Fixed 5% Output Positive Applicable Output Adjustable Negative Output Figures Applicable Output Adjustable g5% g10% (Note 5) Output Figures g5% g10% Voltage Voltage (Note 4) R1 R2 R1 P1 R2 R1 R2 R1 P1 R2 a (4) a a (4) a a (4) b6 (Note 6) 3 (10) a (4) b a ( ) b a ( ) b a ( ) b a ( ) b a b a b TABLE II Formulae for Intermediate Output Voltages Outputs from a2toa7volts Outputs from a4toa250 volts Current Limiting (Figures ) (Figure 7) I LIMIT e V SENSE R V SC OUT e V REF c R2 V R1 a R2J OUT e V REF R2 b R1 c 2 R1 J R3eR4 Outputs from a7toa37 volts Outputs from b6tob250 volts Foldback Current Limiting (Figures ) (Figures ) I KNEE e V OUT R3 R SC R4 a V SENSE (R3 a R4) R SC R4 V OUT e V R1 a R2 REF c V R2 J OUT e V REF R1 a R2 c 2 R1 J R3eR4 I SHORT CKT e V SENSE R3 a R4 c R SC R4 J Typical Applications J TL H R1 R2 Note R3 e R1 a R2 5V for minimum temperature drift Line Regulation (DV IN e 3V) 0 5 mv Load Regulation (DI L e 50 ma) 1 5 mv FIGURE 1 Basic Low Voltage Regulator (V OUT e 2 to 7 Volts) TL H R1 R2 Note R3 e R1 a R2 15V for minimum temperature drift Line Regulation (DV IN e 3V) 1 5 mv R3 may be eliminated for Load Regulation (DI L e 50 ma) 4 5 mv minimum component count FIGURE 2 Basic High Voltage Regulator (V OUT e 7 to 37 Volts) 4
5 Typical Applications (Continued) TL H b15v Line Regulation (DV IN e 3V) 1 mv Load Regulation (DI L e 100 ma) 2 mv FIGURE 3 Negative Voltage Regulator a15v Line Regulation (DV IN e 3V) 1 5 mv Load Regulation (DI L e 1A) 15 mv TL H FIGURE 4 Positive Voltage Regulator (External NPN Pass Transistor) a5v Line Regulation (DV IN e 3V) 0 5 mv Load Regulation (DI L e 1A) 5 mv TL H TL H a5v Line Regulation (DV IN e 3V) 0 5 mv Load Regulation (DI L e 10 ma) 1 mv Short Circuit Current 20 ma FIGURE 6 Foldback Current Limiting FIGURE 5 Positive Voltage Regulator (External PNP Pass Transistor) 5
6 Typical Applications (Continued) Line Regulation (DV IN e 20V) Load Regulation (DI L e 50 ma) a50v 15 mv 20 mv TL H FIGURE 7 Positive Floating Regulator Line Regulation (DV IN e 20V) Load Regulation (DI L e 100 ma) b100v 30 mv 20 mv TL H FIGURE 8 Negative Floating Regulator 6
7 Typical Applications (Continued) Line Regulation (DV IN e 30V) Load Regulation (DI L e 2A) a5v 10 mv 80 mv TL H FIGURE 9 Positive Switching Regulator b15v Line Regulation (DV IN e 20V) 8 mv Load Regulation (DI L e 2A) 6 mv TL H FIGURE 10 Negative Switching Regulator 7
8 Typical Applications (Continued) Note Current limit transistor may be used for shutdown if current limiting is not required Line Regulation (DV IN e 3V) Load Regulation (DI L e 50 ma) a5v 0 5 mv 1 5 mv TL H FIGURE 11 Remote Shutdown Regulator with Current Limiting Line Regulation (DV IN e 10V) Load Regulation (DI L e 100 ma) a5v 0 5 mv 1 5 mv TL H FIGURE 12 Shunt Regulator 8
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