LM317 datasheet(9/12 Pages) ONSEMI

Il numero della parte	LM317

Spiegazioni elettronici	1.5 A Adjustable Output, Positive Voltage Regulator

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Produttore elettronici	ONSEMI [ON Semiconductor]

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LM317, NCV317

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Figure 23. Adjustable Current Limiter

Figure 24. 5.0 V Electronic Shutdown Regulator

Vref

+25 V

Vin

LM317

Vout

R1

1.25

Adjust

Iout

D2

1N4001

2N5640

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.

R2 ≤

Vref

R1 =

VSS*

D1

1N4001

VO < BVDSS + 1.25 V + VSS,

ILmin - IDSS < IO < 1.5 A.

As shown 0 < IO < 1.0 A.

Vin

D1*

1N4002

Vout

120

Adjust

720

+

1.0

mF

MPS2222

1.0 k

TTL

Control

LM317

Minimum Vout = 1.25 V

* D1 protects the device during an input short circuit.

IOmax + IDSS

IDDS

Figure 25. Slow Turn−On Regulator

Figure 26. Current Regulator

+

1.25V

R

1

+

10

mF

Vin

Vout

240

1N4001

LM317

Adjust

MPS2907

R2

50 k

LM317

Vin

Vout

R1

Adjust

IAdj

Iout

10 mA

≤ Iout ≤ 1.5 A

Iout +

V

ref

R

1

) I

Adj

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