CYStech Electronics Corp.
Spec. No. : C513F3
Issued Date : 2003.05.24
Revised Date : . .
Page No. : 1/9
PL317F3 CYStek Product Specification
Three Terminal Adjustable Output
Positive Voltage Regulators
PL317F3
The PL317F3 is an adjustable 3–terminal positive voltage regulator capable
of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V.
This voltage regulator is exceptionally easy to use and requires only two ex-
ternal resistors to set the output voltage. Further, it employs internal current
limiting, thermal shutdown and safe area compensation, making it essentially
blow–out proof.
The PL317F3 serves a wide variety of applications including local, on-card
regulation. This device can also be used to make a programmable output regu-
lator, or by connecting a fixed resistor between the adjustment and output, the
PL317F3 can be used as a precision current regulator.
Output Current in Excess of 1.5 A
Output Adjustable between 1.2 V and 37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting Constant with Temperature
Output Transistor Safe–Area Compensation
Floating Operation for High Voltage Applications
Eliminates Stocking many Fixed Voltages
Standard Application
+ +
PL317
R1
R2
CoutCin
Vin Vout
Maximum Ratings
Rating Symbol Value Unit
Input-Output Voltage Differential VI-VO 40 V
Power Dissipation
TA=25℃
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
PD
JA
JC
Internally Limited
60
3.0
W
℃/W
℃/W
Operating Junction Temperature Range TJ -40 to +125 ℃
Storage Temperature Range Tstg -65 to +150 ℃
TO-263
1.0µF 0.1µF
*Cin is required if regulator is located an appreciate
distance from power supply filter.
**Cout is not needed for stability, however, it does
improve transient response.
Vout=1.25(1+R2/R1)+IAdjR2
Since IAdj is controlled to less than 100 µA, the
error associated with this term is negligible in
most applications.
IAdj