LM317D2T Ver la hoja de datos (PDF) - Motorola => Freescale

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componentes Descripción

Fabricante

LM317D2T

Three-terminal adjustible output positive voltage regulator

Motorola => Freescale 

LM317

Figure 20. ‘‘Laboratory’’ Power Supply with Adjustable Current Limit and Output Voltage

D6*

Vin

32 V to 40 V

Vin1

0.1 µF

LM317

(1)

1N4002

Vout1 RSC

Adjust 1

Current

Limit

Adjust

* Diodes D1 and D2 and transistor Q2 are added to

* allow adjustment of output voltage to 0 V.

1.0K

Q1

2N3822

* D6 protects both LM317’s during an input short circuit.

–10 V

Vin2

D1

1N4001

D2

1N4001

LM317

(2)

Vout 2

240

Adjust 2

5.0 k

Voltage

Adjust

1N4001

D5

IN4001

+

10 µF

Iout

Vout

+

1.0 µF

Tantalum

D3

Output Range: 0 ≤ VO ≤ 25 V

D4

Output Range: 0 ≤ IO ≤ 1.5 A

Q2

2N5640

IN4001

–10 V

Figure 21. Adjustable Current Limiter

+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 22. 5.0 V Electronic Shutdown Regulator

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 23. Slow Turn–On Regulator

Vin

LM317

Vout

240

1N4001

Adjust

R2

50 k

MPS2907

+

10 µF

8

Figure 24. Current Regulator

Vin

Vout R1

Iout

LM317

Adjust

ǒ ǓIAdj

+ ) Iout

Vref

R1

IAdj

+ 1.25 V

R1

10 mA ≤ Iout ≤ 1.5 A

MOTOROLA ANALOG IC DEVICE DATA

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