CYStech Electronics Corp.

Spec. No. : C513E3

Issued Date : 2003.04.09

Revised Date :

. .

Page No. : 7/9

PL317E3

CYStek Product Specification

Application Circuits

+

+

-10V

-10V

Q2

2N5640

1N4001

D4

D3

Q1

2N3822

D2

D1

1N4001

1N4001

1N4001

1.0k

5.0k

RSC

D6*

1N4002

240

D5

10μF

1.0μF

Vout

Vout 2

Vin 2

Vout

1N4001

Tantalum

Vin 1

Vin

32V to 40 V

0.1μF

Adjust 1

Current Limit Adjust

PL317

PL317

(1)

(2)

Adjust 2

Iout

Voltage Adjust

Diodes D1 and D2 and transistor Q2 are added to

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

allow adjustment of output voltage to 0V.

Output Range:0≦Vo≦25V

0≦Io≦1.5A

Vss*

2N5640

D2

D1

1N4001

1N4001

100

R1

Vout

Vin

+25V

Adjust

PL317

Iout

1.25

R2

*To provide current limiting of Io to the system

groung, the source of the FET must be tied to a

negative voltage below -1.25V.

Fig 7. “Laboratory” Power Supply with Adjustable Current Limit and Output Voltage

As shown 0<Io<1.0A

Fig 8. Adjustable Current Limiter

+

PL317

Adjust

720

MPS2222

1.0k

TTL

Control

1.0μF

120

Vout

D1*

1N4002

Vin

*D1 protects the device during an input short circuit.

Fig 9. 5.0V Electronic Shutdown Regulator