LM723.pdf

December 1994

LM723/LM723C Voltage Regulator

General Description

The LM723/LM723C is a voltage regulator designed primar-

ily 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 § Cto

a 70 § C temperature range, instead of b 55 § Cto a 125 § C.

Features

Y 150 mA output current without external pass transistor

Y Output currents in excess of 10A possible by adding

external transistors

Y Input voltage 40V max

Y Output voltage adjustable from 2V to 37V

Y Can be used as either a linear or a switching regulator

Connection Diagrams

Dual-In-Line Package

Metal Can Package

TL/H/8563±2

TL/H/8563±3

Top View

Order Number LM723J/883 or LM723CN

See NS Package J14A or N14A

Note: Pin 5 connected to case.

Top View

Order Number LM723H, LM723H/883 or LM723CH

See NS Package H10C

Equivalent Circuit*

TL/H/8563±20

Top View

Order Number LM723E/883

See NS Package E20A

TL/H/8563±4

*Pin numbers refer to metal can package.

C 1995 National Semiconductor Corporation

TL/H/8563

RRD-B30M115/Printed in U. S. A.

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)

50V

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 b 55 § Cto a 150 § C

LM723C 0 § Cto a 70 § C

Storage Temperature Range Metal Can b 65 § Cto a 150 § C

Molded DIP b 55 § Cto a 150 § C

Lead Temperature (Soldering, 4 sec. max.)

Hermetic Package

Continuous Voltage from V a to V b

40V

Input-Output Voltage Differential

40V

Maximum Amplifier Input Voltage (Either Input)

8.5V

300 § C

Maximum Amplifier Input Voltage (Differential)

Plastic Package

260 § C

Current from V Z

25 mA

ESD Tolerance

1200V

Current from V REF

15 mA

(Human body model, 1.5 k X in series with 100 pF)

Electrical Characteristics (Notes 2, 9)

LM723

LM723C

Parameter

Conditions

Units

Min Typ Max Min Typ Max

Line Regulation

V IN e 12V to V IN e 15V

0.01 0.1

0.01 0.1 % V OUT

b 55 § C s T A s a 125 § C

0.3

% V OUT

0 § C s T A s a 70 § C

0.3 % V OUT

V IN e 12V to V IN e 40V

0.02 0.2

0.1 0.5 % V OUT

Load Regulation

I L e 1mAtoI L e 50 mA

0.03 0.15

0.03 0.2 % V OUT

b 55 § C s T A s a 125 § C

0.6

% V OUT

0 § C s T A s a 70 § C

0.6 % V OUT

Ripple Rejection

f e 50 Hz to 10 kHz, C REF e 0

f e 50 Hz to 10 kHz, C REF e 5 m F

Average Temperature Coeffic- b 55 § C s T A s a 125 § C

0.002 0.015

%/ § C

ient of Output Voltage (Note 8) 0 § C s T A s a 70 § C

0.003 0.015 %/ § C

Short Circuit Current Limit R SC e 10 X ,V OUT e 0

Reference Voltage

6.95 7.15 7.35 6.80 7.15 7.50 V

Output Noise Voltage

BW e 100 Hz to 10 kHz, C REF e 0

m Vrms

BW e 100 Hz to 10 kHz, C REF e 5 m F

2.5

m Vrms

Long Term Stability

0.05

0.05 %/1000 hrs

Standby Current Drain

I L e 0, V IN e 30V

1.7 3.5

1.7 4.0 mA

Input Voltage Range

9.5

40 9.5

Output Voltage Range

2.0

37 2.0

Input-Output Voltage Differential

3.0

38 3.0

i JA

Molded DIP

105

§ C/W

i JA

Cavity DIP

150

§ C/W

i JA

H10C Board Mount in Still Air

165

§ 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 k X connected as shown in Figure1. 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 P36/22-3B7 pot core or equivalent with 0.009 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 Figure13.

Note 6: V a and V CC must be connected to a a 3V 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.

Typical Performance Characteristics

Load Regulation

Load & Line Regulation vs

Characteristics with

Input-Output Voltage

Current Limiting

Differential

Current Limiting

Characteristics vs

Standby Current Drain vs

Characteristics

Junction Temperature

Input Voltage

Output Impedence vs

Line Transient Response

Load Transient Response

Frequency

TL/H/8563±6

Noise vs Filter Capacitor

Maximum Power Ratings

LM723

LM723C

(C REF in Circuit of Figure1)

Power Dissipation vs

(Bandwidth 100 Hz to 10 kHz)

Ambient Temperature

TL/H/8563±7

TABLE I. Resistor Values (k X ) for Standard Output Voltage

Positive Applicable

Fixed

Output

Fixed

5% Output

Negative

Output

Adjustable

Applicable Output

Adjustable

Figures

Output

Voltage Figures g 5% g 10%

(Note 4) R1 R2 R1 P1 R2 R1 R2 R1 P1 R2

a 3.0 1, 5, 6, 9, 12 (4) 4.12 3.01 1.8 0.5 1.2 a 100 7 3.57 102 2.2 10 91

a 3.6 1, 5, 6, 9, 12 (4) 3.57 3.65 1.5 0.5 1.5 a 250 7 3.57 255 2.2 10 240

a 5.0 1, 5, 6, 9, 12 (4) 2.15 4.99 0.75 0.5 2.2 b 6 (Note 6) 3, (10) 3.57 2.43 1.2 0.5 0.75

a 6.0 1, 5, 6, 9, 12 (4) 1.15 6.04 0.5 0.5 2.7 b 9

g 5% g 10% (Note 5)

Voltage

3, 10

3.48 5.36 1.2 0.5 2.0

a 9.0 2, 4, (5, 6, 9, 12) 1.87 7.15 0.75 1.0 2.7 b 12

3, 10

3.57 8.45 1.2 0.5 3.3

a 12 2, 4, (5, 6, 9, 12) 4.87 7.15 2.0 1.0 3.0 b 15

3, 10

3.65 11.5 1.2 0.5 4.3

a 15 2, 4, (5, 6, 9, 12) 7.87 7.15 3.3 1.0 3.0 b 28

3, 10

3.57 24.3 1.2 0.5 10

a 28 2, 4, (5, 6, 9, 12) 21.0 7.15 5.6 1.0 2.0 b 45

3.57 41.2 2.2 10 33

a 45

3.57 48.7 2.2 10 39 b 100

3.57 97.6 2.2 10 91

a 75

3.57 78.7 2.2 10 68 b 250

3.57 249 2.2 10 240

TABLE II. Formulae for Intermediate Output Voltages

Outputs from a 2to a 7 volts

Outputs from a 4to a 250 volts

Current Limiting

(Figures1,5,6,9,12, [ 4 ] )

(Figure7)

I LIMIT e

V SENSE

R SC

R1 a R2

V REF

R2 b R1

V OUT e

V REF c

V OUT e

;R3 e R4

Outputs from a 7to a 37 volts

Outputs from b 6to b 250 volts

Foldback Current Limiting

(Figures2,4,[5,6,9,12] )

(Figures3,8,10)

I KNEE e

V OUT R3

R SC R4 a

V SENSE (R3 a R4)

R SC R4

R1 a R2

V REF

R1 a R2

V OUT e

V REF c

V OUT e

;R3 e R4

V SENSE

R SC

R3 a R4

I SHORT CKT e

Typical Applications

TL/H/8563±8

Typical Performance

Regulated Output Voltage 5V

for minimum temperature drift. Line Regulation ( D V IN e 3V) 0.5 mV

Load Regulation ( D I L e 50 mA) 1.5 mV

FIGURE 1. Basic Low Voltage Regulator

(V OUT e 2 to 7 Volts)

R1 R2

R1 a R2

TL/H/8563±9

Note: R3 e

R1 R2

R1 a R2

Typical Performance

Regulated Output Voltage

15V

for minimum temperature drift. Line Regulation ( D VIN e 3V)

1.5 mV

R3 may be eliminated for

Load Regulation ( D I L e 50 mA) 4.5 mV

minimum component count.

FIGURE 2. Basic High Voltage Regulator

(V OUT e 7 to 37 Volts)

Note: R3 e

Typical Applications (Continued)

TL/H/8563±10

Typical Performance

Regulated Output Voltage b 15V

Line Regulation ( D V IN e 3V) 1 mV

Load Regulation ( D I L e 100 mA) 2 mV

FIGURE 3. Negative Voltage Regulator

TL/H/8563±11

Typical Performance

Regulated Output Voltage a 15V

Line Regulation ( D V IN e 3V) 1.5 mV

Load Regulation ( D I L e 1A) 15 mV

FIGURE 4. Positive Voltage Regulator

(External NPN Pass Transistor)

TL/H/8563±13

TL/H/8563±12

Typical Performance

Regulated Output Voltage a 5V

Line Regulation ( D V IN e 3V) 0.5 mV

Load Regulation ( D I L e 10 mA) 1 mV

Short Circuit Current

Typical Performance

Regulated Output Voltage a 5V

Line Regulation ( D V IN e 3V) 0.5 mV

Load Regulation ( D I L e 1A) 5 mV

FIGURE 5. Positive Voltage Regulator

(External PNP Pass Transistor)

20 mA

FIGURE 6. Foldback Current Limiting

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: