Fairchild LM317AHV service manual

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LM317AHV

3-Terminal Positive Adjustable Regulator

www.fairchildsemi.com

Features

• Output Current in Excess of 1.5A

• Output Adjustable Between 1. 2V and 57V

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe Area Compensation

• TO-220 Package

Internal Block Diagram

Description

This monolithic integrated circuit is an adjustable 3-terminal
positive voltage regulator designed to supply more than 1.5A
of load current with an output voltage adjustable over a 1.2
to 57V. It employs internal current limiting, thermal shut
down and safe area compensation.

TO-220

1

1. Adj 2. Output 3. Input

Output

3

2

3Vin

Input

Voltage

Reference

©2002 Fairchild Semiconductor Corporation

Vad

+

-

Protection

Circuitry

Rlimit

2

Vo

Output

1

Rev. 1.0.1

LM317AHV

Absolute Maximum Ratings

Parameter Symbol Value Unit

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

- V

I
LEAD

D

j

STG

O

60 V

230 °C

Internally limited W

0 ~ +125 °C

-65 ~ +125 °C

Temperature Coefficient of Output Voltage ∆Vo/∆T ±0.02 %/°C

Electrical Characteristics

(VI-VO=5V, IO= 0.5A, 0°C ≤ TJ ≤ + 125°C, I

Parameter Symbol Conditions Min. Typ. Max. Unit

Line Regulation (Note1) Rline

Load Regulation (Note1) Rload

Adjustable Pin Current I

Adjustable Pin Current Change ∆I

Reference Voltage V

Temperature Stability ST
Minimum Load Current to Maintain

Regulation

Maximum Output Current I

RMS Noise, % of V

OUT

Ripple Rejection RR

Long-Term Stability, T

= T

J

HIGH

Thermal Resistance Junction to Case R

= 1.5A, P

MAX

ADJ

ADJ

REF

T

I

L(MIN)VI

O(MAX)

e

N

ST

θJC

= 20W, unless otherwise specified)

DMAX

T

= +25°C

A

3V ≤ V
3V ≤ V
T

- V

≤ 60V

I

O

- V

≤ 60V - 0.02 0.07 %/V

I

O

= +25°C, 10mA ≤I

A

VO< 5V
V

≥ 5V

O

10mA ≤ I

O

≤ I

MAX

VO < 5V
V

5V

O ≥

O ≤IMAX

- 0.01 0.04 %/V

-18

0.4250.5

%/V

-40

0.8701.5

%/V

- - 46 100 µA

3V ≤ VI - V
10mA ≤ I
PD ≤ P

3V ≤ VIN - V
10mA ≤ I
P

≤ P

D

O

MAX

O

MAX

O

≤ I

≤ I

≤60V

MAX

≤60V

O

MAX

-2.05 µA

1.20 1.25 1.30 V

--0.7-%/V

- VO = 60V - 3.5 12 mA

VI - V
VI - V
T

= 25°C

A

O
O

≤ 15V, PD ≤ P
≤ 60V, PD ≤ P

MAX
MAX

1.0

2.2

0.3

-A

TA= +25°C, 10Hz ≤ f ≤ 10kHz - 0.003 0.01 %/V

= 10V, f = 120Hz

V

O

without C
C

ADJ

T

A

ADJ

= 10µF (Note2)

= +25°C for end point

measurements, 1000HR

66 60

-dB

75

-0.31 %

- -5-°C/W

mV

O

mV

O

O

O

Note :

1. Load and line regulation are specified at constant junction temperature. Change in V
into account separately. Pulse testing with low duty is used. (P

2. C

, when used, is connected between the adjustment pin and ground.

ADJ

MAX

= 20W)

2

due to heatin g effe cts must be tak en

D