LM317 datasheet(4/12 Pages) ONSEMI

Part #	LM317

Description	1.5 A Adjustable Output, Positive Voltage Regulator

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Manufacturer	ONSEMI [ON Semiconductor]

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LM317

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4

Figure 2. Load Regulation and

∆IAdj/Load Test Circuit

Figure 3. Standard Test Circuit

Figure 4. Ripple Rejection Test Circuit

VO

LM317

VO (min Load) - VO (max Load)

*Pulse testing required.

* 1% Duty Cycle is suggested.

Load Regulation (mV) = VO (min Load) - VO (max Load)

Load Regulation (% VO) =

x 100

VO (min Load)

VO (max Load)

Cin

0.1 µF

Adjust

R2

1%

CO

1.0 µF

+

*

RL

(max Load)

RL

(min Load)

Vout

R1

240

1%

VI

Vin

IAdj

IL

* Pulse testing required.

* 1% Duty Cycle is suggested.

Vin

Vout

Adjust

R1

240

1%

+

1.0 µF

CO

RL

Cin

R2

1%

To Calculate R2: Vout = ISET R2 + 1.250 V

To Calculate R2: Assume ISET = 5.25 mA

IL

IAdj

ISET

Vref

VO

VI

0.1 µF

Vin

Vout

Vout = 10 V

RL

Cin

0.1 µF

Adjust

R1

240

1%

D1*

1N4002

CO

+

1.0 µF

24 V

14 V

R2

1.65 k

1%

CAdj

10 µF

+

*D1 Discharges CAdj if output is shorted to Ground.

f = 120 Hz

LM317

VO (min Load)

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