PL317E3 Datasheet, PDF (7/9 Pages) Cystech Electonics Corp. – Three Terminal Adjustable Output Positive Voltage Regulators

CYStech Electronics Corp.
Application Circuits
D6*
Spec. No. : C513E3
Issued Date : 2003.04.09
Revised Date : . .
Page No. : 7/9
Vin
32V to 40 V
Vin 1
PL317
(1)
1N4002
Vout RSC
0.1^μF
Adjust 1
Current Limit Adjust
1.0k
Vin 2
Vout 2
Iout _Vout
PL317
(2)
240
Adjust 2
D5
1N4001
D1
1N4001
5.0k
D2
1N4001
+ _1.0μF
Voltage Adjust _{+ 10μF Tantalum}
Q1
2N3822
-10V
D3 _{Output Range:0}≦_Vo≦_25V
1N4001
0^≦Io^≦1.5A
D4
1N4001
Diodes D1 and D2 and transistor Q2 are added to
allow adjustment of output voltage to 0V.
Q2
2N5640
* D6 protects both LM317's during an input short circuit.
-10V
Fig 7. “Laboratory” Power Supply with Adjustable Current Limit and Output Voltage
+25V
Vin
PL317
Vout _R1
1.25
Adjust
R2
100
*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.
R1=Vref/(Iomax+IDSS) R2≤Vref/IDSS
Vo<BVDSS+1.25V+Vss
ILmin-IDSS<Io<1.5A
As shown 0<Io<1.0A
2N5640
Vss*
Fig 8. Adjustable Current Limiter
PL317E3
Iout
D1
1N4001
D2
1N4001
D1*
1N4002
Vin
Vout
PL317
Adjust
120
+ _1.0μF
MPS2222
720
TTL
Control
1.0k
*D1 protects the device during an input short circuit.
Fig 9. 5.0V Electronic Shutdown Regulator
CYStek Product Specification