Datasheet 搜索 > 稳压芯片 > TI（德州仪器） > LM1117MP-1.8/NOPB 数据手册 > LM1117MP-1.8/NOPB 数据手册 10/33 页
￥ 2.905
LM1117MP-1.8/NOPB 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:
TEXAS INSTRUMENTS LM1117MP-1.8/NOPB 稳压器, 固定LDO, 15V输入, 1.2V压差, 1.8V/800mA输出, SOT-223-3
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
典型应用电路图在P1P10P16
原理图在P2
封装尺寸在P19P20P21P23P24P25P26
标记信息在P19P20P21P22
封装信息在P19P20P21P22P23P24P25P26
技术参数、封装参数在P3
应用领域在P1P33
电气规格在P3P4P5P6P7P8
导航目录
LM1117MP-1.8/NOPB数据手册
Page:
of 33 Go
若手册格式错乱，请下载阅览PDF原文件
LM1117-N, LM1117I
SNOS412M –FEBRUARY 2000–REVISED MARCH 2013
www.ti.com
Figure 20. Typical Application using Fixed Output Regulator
When the adjustable regulator is used (Figure 21), the best performance is obtained with the positive side of the
resistor R1 tied directly to the output terminal of the regulator rather than near the load. This eliminates line drops
from appearing effectively in series with the reference and degrading regulation. For example, a 5V regulator with
0.05Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05Ω x I
L
.
If R1 (=125Ω) is connected near the load, the effective line resistance will be 0.05Ω (1+R2/R1) or in this case, it
is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the load to
provide remote ground sensing and improve load regulation.
Figure 21. Best Load Regulation using Adjustable Output Regulator
PROTECTION DIODES
Under normal operation, the LM1117-N regulators do not need any protection diode. With the adjustable device,
the internal resistance between the adjust and output terminals limits the current. No diode is needed to divert
the current around the regulator even with capacitor on the adjust terminal. The adjust pin can take a transient
signal of ±25V with respect to the output voltage without damaging the device.
When a output capacitor is connected to a regulator and the input is shorted to ground, the output capacitor will
discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the
output voltage of the regulator, and rate of decrease of V
IN
. In the LM1117-N regulators, the internal diode
between the output and input pins can withstand microsecond surge currents of 10A to 20A. With an extremely
large output capacitor (≥1000 µF), and with input instantaneously shorted to ground, the regulator could be
damaged.
In this case, an external diode is recommended between the output and input pins to protect the regulator, as
shown in Figure 22.
10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM1117-N LM1117I
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
