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LM25576_0703

更新时间： 2024-11-19 04:44:39
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器开关
页数 文件大小 规格书
24页 433K
描述
SIMPLE SWITCHER㈢ 42V, 3A Step-Down Switching Regulator

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中文翻译

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LM25576_0703 数据手册

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March 2007  
LM25576  
SIMPLE SWITCHER® 42V, 3A Step-Down Switching  
Regulator  
General Description  
Features  
The LM25576 is an easy to use SIMPLE SWITCHER® buck  
regulator which allows design engineers to design and opti-  
mize a robust power supply using a minimum set of compo-  
nents. Operating with an input voltage range of 6 - 42V, the  
LM25576 delivers 3A of continuous output current with an in-  
tegrated 170mΩ N-Channel MOSFET. The regulator utilizes  
an Emulated Current Mode architecture which provides in-  
herent line regulation, tight load transient response, and ease  
of loop compensation without the usual limitation of low-duty  
cycles associated with current mode regulators. The operat-  
ing frequency is adjustable from 50kHz to 1MHz to allow  
optimization of size and efficiency. To reduce EMI, a frequen-  
cy synchronization pin allows multiple IC’s from the  
LM(2)557x family to self-synchronize or to synchronize to an  
external clock. The LM25576 guarantees robustness with cy-  
cle-by-cycle current limit, short-circuit protection, thermal  
shut-down, and remote shut-down. The device is available in  
a power enhanced TSSOP-20 package featuring an exposed  
die attach pad for thermal dissipation. The LM25576 is sup-  
ported by the full suite of WEBENCH® On-Line design tools.  
Integrated 42V, 170mΩ N-channel MOSFET  
■
■
■
■
■
Ultra-wide input voltage range from 6V to 42V  
Adjustable output voltage as low as 1.225V  
1.5% feedback reference accuracy  
Operating frequency adjustable between 50kHz and  
1MHz with single resistor  
Master or slave frequency synchronization  
Adjustable soft-start  
■
■
■
■
■
Emulated current mode control architecture  
Wide bandwidth error amplifier  
Built-in protection  
Package  
TSSOP-20EP (Exposed Pad)  
■
Simplified Application Schematic  
20208701  
WEBENCH® is a registered trademark of National Semiconductor Corporation.  
© 2007 National Semiconductor Corporation  
202087  
www.national.com  
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