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LM317EMP 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
稳压芯片
封装:
TO-261-4
描述:
LM117 / LM317A / LM317 -N三端可调稳压器 LM117/LM317A/LM317-N 3-Terminal Adjustable Regulator
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3P4Hot
典型应用电路图在P1P15P16P17P18P19P20P21P22P23P24P25
原理图在P12
封装尺寸在P36P38P39
标记信息在P36P37
封装信息在P35P36P37P38P39
技术参数、封装参数在P5P6P35
应用领域在P1P15P16P17P18P19P20P21P22P23P24P25
电气规格在P6P7
导航目录
LM317EMP数据手册
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LM117
mV
Short circuit current is approximately , or 210 mA
R
600
3
-
LM317-N
LM117
,
LM317-N
www.ti.com
SNVS774P –MAY 2004–REVISED OCTOBER 2015
Typical Applications (continued)
9.2.11 Current-Limited Voltage Regulator
A maximum limit on output current can be set using the circuit shown in Figure 29. The load current travels
through R3 and R4. As the load current increases, the voltage drop across R3 increases until the NPN transistor
is driven, during which the ADJ pin is pulled down to ground and the output voltage is pulled down to the
reference voltage of 1.25 V.
(Compared to LM117's higher current limit)
—At 50 mA output only ¾ volt of drop occurs in R
3
and R
4
Figure 29. Current-Limited Voltage Regulator
9.2.12 Adjusting Multiple On-Card Regulators With Single Control
Figure 30 shows how multiple LM117 regulators can be controlled by setting one resistor. Because each device
maintains the reference voltage of about 1.25 V between its V
OUT
and ADJ pins, we can connect each ADJ rail to
a single resistor, setting the same output voltage across all devices. This allows for independent outputs, each
responding to its corresponding input only. Designers must also consider that by the nature of the circuit,
changes to R1 and R2 will affect all regulators.
NOTE: *All outputs within ±100 mV
†Minimum load—10 mA
Figure 30. Adjusting Multiple On-Card Regulators With Single Control
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Links: LM117 LM317-N
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