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LM317T Datenblatt(PDF) 1 Page - ON Semiconductor

Teilenummer LM317T
Bauteilbeschribung  1.5 A Adjustable Output, Positive Voltage Regulator
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© Semiconductor Components Industries, LLC, 2005
August, 2005 − Rev. 8
1
Publication Order Number:
LM317/D
LM317, NCV317
1.5 A Adjustable Output,
Positive Voltage Regulator
The LM317 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 external 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 LM317 serves a wide variety of applications including local, on
card regulation. This device can also be used to make a programmable
output regulator, or by connecting a fixed resistor between the
adjustment and output, the LM317 can be used as a precision current
regulator.
Features
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
Available in Surface Mount D2PAK−3, and Standard 3−Lead
Transistor Package
Eliminates Stocking many Fixed Voltages
Pb−Free Packages are Available
Figure 1. Standard Application
**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.
Since IAdj is controlled to less than 100 mA, the error associated with this term is
negligible in most applications.
Vout + 1.25 V 1 )
R
2
R
1
) I
Adj
R
2
LM317
Vin
Vout
R1
240
R2
Adjust
IAdj
Cin*
0.1
mF
+ C
O**
1.0
mF
TO−220
T SUFFIX
CASE 221A
Pin 1. Adjust
2. Vout
3. Vin
D2PAK−3
D2T SUFFIX
CASE 936
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3
1
2
Heatsink surface connected to Pin 2.
3
1
2
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
DEVICE MARKING INFORMATION


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