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LM317_06

更新时间： 2024-11-25 05:42:03
品牌 Logo 应用领域
安森美 - ONSEMI 稳压器
页数 文件大小 规格书
12页 147K
描述
1.5 A Adjustable Output, Positive Voltage Regulator

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LM317_06 数据手册

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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.  
http://onsemi.com  
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.  
2
D PAK−3  
D2T SUFFIX  
CASE 936  
2
1
3
Features  
Heatsink surface (shown as terminal 4 in  
case outline drawing) is connected to Pin 2.  
• 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  
TO−220  
T SUFFIX  
CASE 221AB  
2
• Available in Surface Mount D PAK−3, and Standard 3−Lead  
Transistor Package  
1
• Eliminates Stocking many Fixed Voltages  
• Pb−Free Packages are Available  
Pin 1. Adjust  
2
2. V  
3
out  
3. V  
in  
Heatsink surface connected to Pin 2.  
V
in  
V
out  
LM317  
R
1
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 10 of this data sheet.  
240  
I
Adj  
Adjust  
+
C *  
C **  
O
in  
0.1 mF  
1.0 mF  
R
2
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 10 of this data sheet.  
**ꢀC is required if regulator is located an appreciable distance from power supply filter.  
in  
**ꢀC is not needed for stability, however, it does improve transient response.  
O
R
2
ꢀ +ꢀ 1.25ꢀVꢀǒ1 ) Ǔꢀ )ꢀ I  
V
ꢀR  
out  
2
Adj  
R
1
Since I is controlled to less than 100 mA, the error associated with this term is  
Adj  
negligible in most applications.  
Figure 1. Standard Application  
© Semiconductor Components Industries, LLC, 2006  
1
Publication Order Number:  
August, 2006 − Rev. 9  
LM317/D  
1234567...12

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