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LM317BT

更新时间： 2024-11-20 21:00:27
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摩托罗拉 - MOTOROLA /
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LM317BT 数据手册

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Order this document by LM317/D  
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.  
THREE–TERMINAL  
ADJUSTABLE POSITIVE  
VOLTAGE REGULATOR  
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.  
SEMICONDUCTOR  
TECHNICAL DATA  
• 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  
T SUFFIX  
PLASTIC PACKAGE  
CASE 221A  
2
• Available in Surface Mount D PAK, and Standard 3–Lead Transistor  
Heatsink surface  
connected to Pin 2.  
Package  
1
2
• Eliminates Stocking many Fixed Voltages  
3
Pin 1. Adjust  
2. V  
3. V  
out  
in  
Standard Application  
V
V
in  
out  
LM317  
D2T SUFFIX  
R
240  
1
PLASTIC PACKAGE  
CASE 936  
I
2
Adj  
1
Adjust  
2
(D PAK)  
+
3
C
*
µ
C
1.0  
**  
µ
in  
0.1  
O
F
F
R
2
Heatsink surface (shown as terminal 4 in  
case outline drawing) is connected to Pin 2.  
ORDERING INFORMATION  
Operating  
** 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
Temperature Range  
Device  
LM317BD2T  
LM317BT  
LM317D2T  
LM317T  
Package  
R
2
Surface Mount  
Insertion Mount  
Surface Mount  
Insertion Mount  
V
1.25 V  
1
I
R
out  
2
Adj  
T = –40° to +125°C  
R
J
1
Since I  
is controlled to less than 100 µA, the error associated with this term is  
Adj  
negligible in most applications.  
T = 0° to +125°C  
J
Motorola, Inc. 1996  
Rev 1  
1234567...12

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