datasheet.hk lm317 521572

DescriptionThe LM317 is an adjustable 3-terminal positive voltageregulator capable of supplying in excess of 1.5A over anoutput voltage range of 1.2V to 37V. This voltage regulatoris exceptionally easy to use and requires only two externalresistors to set the output voltage. Further, it employs internalcurrent limiting, thermal shutdown and safe area compen-sation, making it essentially blow-out proof.

Features Output current in excess of 1.5 ampere Output adjustable between 1.2V and 37V Internal thermal overload protection Internal short-circuit current limiting

constant with temperature Output transistor safe-area compensation Floating operation for high voltage applications Eliminates stocking many fixed voltages

Mechanical DataCase: TO-220 and TO-263 packagesWeight: approx. 1.35g

Case outlines are on the back page.

Pin Arrangement

1

1 Output

Rlimit

Input

Vadj

3

2

Voltage Reference

ProtectionCircuitry

+

--

Functional Block Diagram

Vin Vout

Cin0.1F

LM317

Co1F

IADJ AdjustR1

240

R2

Maximum Ratings Ratings at 25C ambient temperature unless otherwise specified.Parameter Symbol Value UnitInput-Output Voltage Differential Vi-Vo 40 VdcJunction-to-Case Thermal Resistance TO-220 RJC 3.0 CTO-263 3.0Power Dissipation, 25C Case Temperature PD 15 WOperating Junction Temperature Range TJ 0 to +125 CStorage Junction Temperature Range Tstg 65 to +150 C

1. Adjust2. Vout3. VinHeatsink is connected to pin 2

Standard Application

Notes:Cin is required if regulator is located an appreciable distance from powersupply filter.Co is not needed for stability, however, it does improve transient response.Vout = 1.25V (1 + R2/R1) + IAdj R2Since IAdj is controlled to less than 100A, the error associated with thisterm is negligible in most applications

32TO-220

(LM317CT)

TO-263(LM317CM)

13

2

LM317Vishay

formerly General Semiconductor

Document Number 74809 www.vishay.com30-Oct-02 1

New Product

3-Terminal Adjustable Output Positive Voltage Regulators

www.vishay.com Document Number 748092 30-Oct-02

Electrical Characteristics LM317Vi -Vo = 5V, Io = 0.5A, TJ = Tlow to Thigh (see Note 1), Imax and Pmax per Note 2, unless otherwise noted.Parameter Symbol Conditions Min. Typ. Max. Unit

Line Regulation (Fig. 1)(3) REGlineTA = 25C 0.01 0.04

%Vo/V3.0V VI Vo 40V TJ = 0C thru 125C 0.02 0.07

Load Regulation (Fig. 2)(3) REGloadVo 5.0 5 25 mV

TJ = 25C, 10mA Io 1.5A Vo 5.0 0.1 0.5 %Vo

Load Regulation (Fig. 2)(3) REGloadVo 5.0 20 70 mV

10mA Io 1.5A Vo 5.0 0.3 1.5 %VoThermal Regulation REGtherm TJ = 25C, 20ms Pulse 0.03 0.07 %Vo/WAdjustment Pin Current (Fig. 3) IAdj 50 100 A

Adjustment Pin Current Change IAdj 10mA IL 1.5A 0.2 5 A2.5V VI Vo 40V

Reference Voltage (Fig. 3)(4) Vref 10mA Io 1.5A 1.225 1.25 1.275 V3V VI Vo 40VTemperature Stability (Fig. 3) TS Tlow TJ Thigh 1 %VoMin. Load Current to Maintain Regulation (Fig. 3) ILmin VI Vo = 40V 3.5 10 mA

Maximum Output Current (Fig. 3) ImaxVI Vo 15V 1.5 2.2

AVI Vo = 40V, TJ = 25C 0.15 0.4

RMS Noise, % of Vo N TJ = 25C, 10HZ f 10KHZ 0.003 %Vo

Ripple Rejection (Fig. 4) RR Vo = 10V, f = 120HZ(5)

65 dBCAdj = 10F 66 80

Long-Term Stability (after 1000 hr) Fig. 3 S TJ = 125C(6)

, TJ = 25C for 0.3 1.0 %Endpoint Measurements

Thermal Resistance Junction to Case RJC Tlow TJ Thigh 5.0 C/WNotes:(1) Tlow = 0C Thigh = 125C(2) Imax = 1.5A Pmax is internally limited(3) Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account separately.

Pulse testing with low duty cycle is used.(4) Selected devices with tightened tolerance reference voltage available.(5) CAdj, when used, is connected between the addjustment pin and ground.(6) Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.

LM317Vishay formerly General Semiconductor

VinVI Vout

Cin

0.1F

Co

1F

Adjust R1

R21%

2401%

LM317

RL(min.Load)

VOH (min. Load) VOL (max. Load)

Pulse Testing Required:1% Duty Cycle is Suggested

Vin Vout

Cin0.1F

Co

1F

Adjust R1

R21%

2401%

LM317

RL

VIH VIL

VOH VOL


Vin Vout

Cin

0.1F

Co

1F

Adjust R1

R21%

2401%

RL


To Calculate R2:Vo = ISET R2 + 1.250VAssume ISET = 5.25mA

Fig. 3 Standard Test Circuit

LM317Vin Vout Vo = 10V

Cin

0.1F

Co

1F

AdjustR1

R21%

2401%

RL

Fig. 4 Ripple Rejection Test Circuit

LM317

CAdj

10F

*D1 Discharges CADJ if Output is Shorted to Ground

*D11N4002

24V14V

f = 120HZ

IADJ

VI

IADJ

ISET

Vref

IL

Vo Vo

IL

IADJ

Fig. 2 Load Regulation and Iadj/Load Test Circuit

Fig. 1 Line Regulation Test Circuit

Line Regulation (%/V) = x100VOH -- VOLVOL

Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load)Load Regulator (%Vo) = x100Vo(min. Load) -- Vo(max. Load)

Vo(min. Load)

LM317Vishay




0

0.2

0.4

0.6

--75 --50 --25 0 25 50 75 100 125 150 175

Fig. 5 Load Regulation

Vo -- O

utpu

t Volta

ge C

hang

e (%

)

--1.0

--0.8

--0.6

--0.4

--0.2

0

1

2

3

0 10 20 30 40

Fig. 6 Current Limit

I o -- O

utpu

t Cur

rent

(A)

4

--75 --50 --25 0 25 50 75 100 125 150 175

Fig. 7 Adjustment Pin Current

I AD

J -- Ad

justm

ent P

in Cu

rrent

(A)

35

40

45

50

55

60

65

70

75

--75 --50 --25 0 25 50 75 100 125 150 175

Fig. 9 Temperature Stability

V ref -

- R

efer

ence

Volta

ge (V

)

1.220

1.230

1.240

1.250

1.260

--75 --50 --25 0 25 50 75 100 125 150 175

Fig. 8 Dropout Voltage

V I -- V o

-- In

put -

- O

utpu

t Volta

ge

Diff

eren

tial (V

dc)

1.0

1.5

2.0

2.5

3.0

IL = 1.5A

IL = 1.0A

IL = 500mA

IL = 200mAIL = 20mA

Vo = 100mV

0

0.2

0.4

0.6

--75 --50 --25 0 25 50 75 100 125 150 175

Vo -- O

utpu

t Volta

ge C

hang

e (%

)

--1.0

--0.8

--0.6

--0.4

--0.2

VI = 15VVo = 10V

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

4.0

4.5

0 10 20 30 40 50

Fig. 10 Minimum Operating Current

I O -- Qu

iesce

nt C

urre

nt (m

A)

TJ = --55C

TJ = 25C

5.0

TJ = 150C

IL = 0.5A

IL = 1.5A

TJ = 25C

TJ = 150C TJ = --55C

Ratings and Characteristic Curves (TA = 25C unless otherwise noted)


20

40

60

80

100

5 10 15 20 25 30 35 40

Fig. 11 Ripple Rejectionvs. Output Voltage

RR

-- R

ippl

e Re

jectio

n (db

)

Vo -- Output Voltage (V)

0 10 20 30 40

VI -

- In

put V

olta

ge V

o -- O

utpu

t Volta

geCh

ange

(V)

D

eviat

ion (V

)

t -- Time (s)

0

0.5

1.0

0

0.5

1.0

1.5

--1.5

--1.0

--0.5

00

VI -- Vo = 5VIL = 500mAf = 120HZTJ = 25C

CAdj = 10F

Without CAdj

20

40

60

80

100

100 1K 100K10K 1M

Fig. 13 Ripple Rejectionvs. Frequency

RR

-- R

ippl

e Re

jectio

n (db

)

f -- Frequency (Hz)

010

IL = 500mAVI = 15VVo = 10VTJ = 25C

CAdj = 10F

Without CAdj

20

40

60

80

100

120

140

0.01 0.1 101

Fig. 12 Ripple Rejectionvs. Output Current

RR

-- R

ippl

e Re

jectio

n (db

)Io -- Output Current (A)

0

VI = 15VVo = 10Vf

=

120HZTJ = 25C

CAdj = 10F

Without CAdj

10--3

10--2

10--1

100

101

100 1K 100K10K 1M

Fig. 14 Output Impedance

Out

put I

mpe

danc

e (

)

f -- Frequency (Hz)10

VI = 15VVo = 10VIL = 500mATJ = 25C

Vo = 10VIL = 50mATJ = 25C

Without CAdj

CAdj = 10F

CL = 1F CAdj = 10F

CL = 0 Without CAdj

VI

0 10 20 30 40

I L -- Lo

ad

V

o -- O

utpu

t Volta

geCu

rrent

(A)

D

eviat

ion (V

)

t -- Time (s)

0

0.5

1.0

1.5

0

1

2

3

--3

--2

--1

VI = 15VVo = 10VINL = 50mATJ = 25C

CL = 1F CAdj = 10F

CL = 0 Without CAdj

IL

Fig. 16 Load Transient ResponseFig. 15 Line Transient Response

Ratings and Characteristic Curves (TA = 25C unless otherwise noted)

LM317Vishay




13.9 0.41

2.53 0.185

3.84 0.6 Dia.10.25 0.25

28.7 0.92

3.94 0.375

2.69 0.25

0.8 0.121.3 0.185

1.27 0.12

2.55 0.375

4.85 0.375

0.387 0.09

8.54 0.26

6.26 0.25

14.8 0.51

TO-220 Case Outline

Dimensions in millimeters

8.5

15.24

2.54 0.8

10.29 4.471.27

0.6

8 Max.

1.6520

2.54

Seating Plane.10

TO-263 Case Outline

Dimensions in millimeters


datasheet.hk lm317 521572

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