CYStech Electronics Corp.
Three Terminal Adjustable Output
Positive Voltage Regulators
Spec. No. : C513E3
Issued Date : 2003.04.09
Revised Date :2005.05.17
Page No. : 1/10
LM317E3
The LM317E3 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 LM317E3 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
LM317E3 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
TO-220AB
Standard Application
Vin
PL317
LM317
+
Vout
R1
+
＊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.
I
Adj
R2
Cin
Cout
0.1µF
1.0µF
V
out=
1.25(
1+
R
2/
R
1
)+I
Adj
R
2
Since
I
Adj
is controlled to less than 100 µA, the
error associated with this term is negligible in
most applications.
Maximum Ratings
Rating
Input-Output Voltage Differential
Power Dissipation
T
A
=25℃
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
Operating Junction Temperature Range
Storage Temperature Range
LM317E3
Symbol
V
I
-V
O
P
D
θ
JA
θ
JC
T
J
Tstg
Value
40
Internally Limited
65
5.0
-40 to +125
-65 to +150
Unit
V
W
℃/W
℃/W
℃
℃
CYStek Product Specification
CYSTEKEC [ CYSTECH ELECTONICS CORP. ]
