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LM317CT Fiches technique(PDF) 1 Page - Vishay Siliconix

No de pièce LM317CT
Description  3-Terminal Adjustable Output Positive Voltage Regulators
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

LM317CT Fiches technique(HTML) 1 Page - Vishay Siliconix

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LM317CM & LM317CT
Vishay Semiconductor
Document Number 74809
www.vishay.com
29-Nov-01
1
New Product
3-Terminal Adjustable Output Positive Voltage Regulators
Description
The LM317 is an adjustable 3-terminal positive voltage
regulator capable of supplying in excess of 1.5A over an
output voltage range of 1.2V to 37V. This voltage regulator
is exceptionally easy to use and requires only two external
resistors to set the output voltage. Further, it employs internal
current limiting, thermal shutdown and safe area compen-
sation, making it essentially blow-out proof.
Features
• Output current in excess of 1.5 ampere
• Output adjustable between 1.2V and 37V
• 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
Mechanical Data
Case: TO-220 and TO-263 packages
Weight: approx. 1.35g
Case outlines are on the back page.
Pin Arrangement
1
1
Output
Rlimit
Input
Vadj
3
2
Voltage
Reference
Protection
Circuitry
+
--
Functional Block Diagram
Vin
Vout
Cin
0.1
µF
LM317
Co
1
µF
IADJ
Adjust
R1
240
R2
Maximum Ratings Ratings at 25°C ambient temperature unless otherwise specified.
Parameter
Symbol
Value
Unit
Input-Output Voltage Differential
Vi-Vo
40
Vdc
Power Dissipation, 25°C Free-Air Temperature
PD
2W
Power Dissipation, 25°C Case Temperature
PD
15
W
Operating Junction Temperature Range
TJ
0 to +125
°C
Storage Junction Temperature Range
Tstg
–65 to +150
°C
1. Adjust
2. Vout
3. Vin
Heatsink is connected to pin 2
Standard Application
Notes:
Cin is required if regulator is located an appreciable distance from power
supply filter.
Co is not needed for stability, however, it does improve transient response.
Vout = 1.25V (1 + R2/R1) + IAdj R2
Since IAdj is controlled to less than 100
µA, the error associated with this
term is negligible in most applications
3
2
TO-220
(LM317CT)
TO-263
(LM317CM)
1
3
2


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