LM3481

更新时间： 2024-09-16 04:44:27

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关控制器
页数	文件大小	规格书
22页	442K
描述
High Efficiency Low-Side N-Channel Controller for Switching Regulators

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LM3481 数据手册

November 16, 2007

LM3481

High Efficiency Low-Side N-Channel Controller for

Switching Regulators

General Description

Key Specifications

The LM3481 is a versatile Low-Side N-FET high performance

controller for switching regulators. It is suitable for use in

topologies requiring a low-side FET, such as boost, flyback,

SEPIC, etc. The LM3481 can be operated at extremely high

switching frequencies in order to reduce the overall solution

size. The switching frequency of the LM3481 can be adjusted

to any value between 100 kHz and 1 MHz by using a single

external resistor or by synchronizing it to an external clock.

Current mode control provides superior bandwidth and tran-

sient response in addition to cycle-by-cycle current limiting.

Current limit can be programmed with a single external resis-

tor.

Wide supply voltage range of 2.97V to 48V

■

100 kHz to 1 MHz Adjustable and Synchronizable clock

frequency

±1.5% (over temperature) internal reference

■

10 µA shutdown current (over temperature)

Features

10-lead MSOP package

■

Internal push-pull driver with 1A peak current capability

Current limit and thermal shutdown

Frequency compensation optimized with a capacitor and

a resistor

The LM3481 has built in protection features such as thermal

shutdown, short-circuit protection and over voltage protec-

tion. Power saving shutdown mode reduces the total supply

current to 5µA and allows power supply sequencing. Internal

soft-start limits the inrush current at start-up.

Internal softstart

■

Current Mode Operation

Adjustable Undervoltage Lockout with Hysteresis

Pulse Skipping at Light Loads

Applications

Distributed Power Systems

■

Notebook, PDA, Digital Camera, and other Portable

Applications

Offline Power Supplies

■

Set-Top Boxes

Typical Application Circuit

201365a5

Typical SEPIC Converter

201365

www.national.com

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与LM3481相关器件

型号	品牌	获取价格	描述	数据表
LM3481MM	NSC	获取价格	High Efficiency Low-Side N-Channel Controller for Switching Regulators
LM3481MM	TI	获取价格	LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
LM3481MM/NOPB	TI	获取价格	2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback 10-VSSOP -40 to 125
LM3481MMX	TI	获取价格	LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
LM3481MMX	NSC	获取价格	High Efficiency Low-Side N-Channel Controller for Switching Regulators
LM3481MMX/NOPB	TI	获取价格	2.97V 至 48V 高效升压、SEPIC 和反激式控制器 \| DGS \| 10 \| -
LM3481-Q1	TI	获取价格	符合 AEC-Q100 标准的 2.97V 至 48V 高效升压、SEPIC 和反激式控制
LM3481QMM	TI	获取价格	LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching
LM3481QMM/NOPB	TI	获取价格	48V Wide Vin High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters 10-V
LM3481QMMX	TI	获取价格	LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching