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317B

1.5 A Adjustable Output, Positive Voltage Regulator

ON Semiconductor 

LM317

+25 V

Vout R1

LM317

Iout

Vin

1.25

Adjust

R2

100

* To provide current limiting of IO to the system

* ground, the source of the FET must be tied to a

* negative voltage below - 1.25 V.

R1 =

Vref

IOmax + IDSS

R2 ≤

Vref

IDDS

VO < BVDSS + 1.25 V + VSS,

ILmin - IDSS < IO < 1.5 A.

As shown 0 < IO < 1.0 A.

D1

1N4001

D2

1N4001

2N5640

VSS*

Figure 21. Adjustable Current Limiter

D1*

1N4002

Vin

Vout

LM317

+

120

1.0 µF

Adjust

720

MPS2222

1.0 k

TTL

Control

Minimum Vout = 1.25 V

* D1 protects the device during an input short circuit.

Figure 22. 5.0 V Electronic Shutdown Regulator

Vin

Vout

LM317

240

1N4001

Adjust

R2

50 k

MPS2907

+

10 µF

Figure 23. Slow Turn–On Regulator

Vin

Vout R1

Iout

LM317

Adjust

IAdj

ǒ Ǔ IoutĂ +Ă

Vref

R1

Ă )Ă IAdjĂ

+Ă 1.R251ĂVĂ

10 mA ≤ Iout ≤ 1.5 A

Figure 24. Current Regulator

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