Fairchild LM317 service manual

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LM317
3-Terminal Positive Adjustable Regulator

LM317 3-Terminal Positive Adjustable Regulator

March 2000
Revised June 2005

General Description

This monolithic integrated circuit is an adjustable 3-terminal
positive voltage regulator designed to supply more than

1.5A of load current wit h an output v oltage a djustabl e over
a 1.2 to 37V. It employs internal current limiting, thermal
shut-down and safe area compensation.

Features

■ Output Current In Excess of 1.5A

■ Output Adjustable Between 1.2V and 37V

■ Internal Thermal Overload Protection

■ Internal Short Circuit Current Limiting

■ Output Transistor Safe Operating Area Compen satio n

■ TO-220 Package

■ D2 PAK Package

Ordering Code:

Product Number Package Operating Temperature

LM317T TO-220 0
LM317D2TXM D2 PAK 0

Connection Diagrams

Internal Block Diagram

q

C to 125qC

q

C to 125qC

© 2005 Fairchild Semiconductor Corporation DS400281 www.fairchildsemi.com

Absolute Maximum Ratings

LM317

Input-Output Voltage Differential V
Lead Temperature T
Power Dissipation P
Operating Junction Temperature Range T
Storage Temperature Range T
Temperature Coefficient of Output Voltage

Note 1: Absolute Maximum Rating s: are those values beyond which the safety of the devic e canno t be guara nteed. T he device should no t be oper ated at
these limits. The parametric values defined in the Electr ic al C haracteristics tables are not gu aranteed at the absolute m ax im um ratings. The “Recommended
Operating Cond iti ons” table will define the c onditions for actual device operation.

Parameter Symbol Value Unit

- V

I

LEAD

'

VO/'T

O

D

j

STG

40 V

230

Internally limited W

0 a 125



65 a 125

r

0.02 % / qC

Electrical Characteristic

(VI - VO 5V, IO 0.5A, 0qC d TJ d  125qC, I

Parameter Symbol Conditions Min Typ Max Unit

Line Regulation (Note 2) Rline T

Load Regulation (Note 2) Rload TA 25qc, 10mA d IO d I

Adjustable Pin Current I
Adjustable Pin Current Change

Reference Voltage V

Temperature Stability ST
Minimum Load Current to Maintain Regulation I
Maximum Output Current I

RMS Noise,% of V
Ripple Rejection RR VO 10V, f 120Hz without C

Long-Term Stability, TJ T
Thermal Resistance Junction to Case R

Note 2: Load and line re gulation are specif ied at constant junc t ion temperature. C hange in VD due to heating effec ts must be taken int o account separately.
Pulse testing with low duty is used. (P

Note 3: CADJ, when used, is c onnected between th e adjustment pin and ground.

OUT

HIGH

MAX

20S)

1.5A, P

MAX

25qC

A

3V d VI  VO d 40V
3V d VI  VO d 40V – 0.02 0.07 % / V

VO  5V – 18.0 25.0 mV% / V
VO t 5V 0.4 0.5
10mA d IO d I
VO  5V – 40.0 70.0 mV% / V
VO t 5V 0.8 1.5

ADJ

'

I

3V d VI  VO d 40V

ADJ

10mA d IO d I
3V d VIN - VO d 40V

REF

PD d P

T

- VO 40V – 3.5 12.0 mA

L(MIN)VI

O(MAX)VI

- VO d 15V, PD d P

- VO d 40V, PD d P

I

TA 25qC

eN TA 25qC, 10Hz d f d 10KHz – 0.003 0.01 % / V

C

10PF (Note 3) 75.0

ADJ

ST TA 25qC for end point measurements, 1000HR – 0.3 1.0 %

T

JC

20W, unless otherwise specified)

DMAX

MAX

MAX

––46.0 100

d P

MAX PD

MAX

MAX

MAX

––0.7 – % / V

MAX
MAX

ADJ

––5.0 –qC / W

–– 0.01 0.04 % / V

– 2.0 5.0

1.20 1.25 1.30 V10mA d IO d I

1.0 2.2

0.3 –

66.0 60.0 –

q

C

q

C

q

C

O

O

P

A

P

A

O

AV

O

dB

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