LM317L 查看數據表（PDF） - Motorola => Freescale

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LM317L

Three-Terminal Adjustable Positive Voltage Regulator

Motorola => Freescale 

LM317L

Figure 19. Adjustable Current Limiter

Figure 20. 5 V Electronic Shutdown Regulator

+25V

Vout R1

VO

IO

LM317L

Vin

1.25k

Adjust

* To provide current limiting of IO

to the system ground, the source of

the current limiting diode must be tied to

a negative voltage below – 7.25 V.

R2 ≥

Vref

IDSS

R1 =

Vref

IOmax + IDSS

VO < POV + 1.25 V + VSS

ILmin – IP < IO < 100 mA – IP

As shown O < IO < 95 mA

D1

R2

1N914

500

D2

1N914

1N5314

VSS*

D1

1N4002

Vin

Vout

LM317L

+

120

1.0µF

Adjust

720

MPS2222

1.0k

TTL

Control

Minimum Vout = 1.25 V

D1 protects the device during an input short circuit.

Figure 21. Slow Turn–On Regulator

Vin

Vout

LM317L

240

1N4002

Adjust

R2

50k

MPS2907

+

10µF

Figure 22. Current Regulator

Iout

Vin

R1 R2

LM317L

Vout

Adjust

IAdj

Ioutmax =

Vref

R1

^ 1.25 V

+ IAdj

R1

^ Ioutmax =

Vref

R1 + R2

1.25 V

+ IAdj R1 + R2

5.0 mA < Iout < 100 mA

8

MOTOROLA ANALOG IC DEVICE DATA

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