Datasheet > LM3407_09

LM3407_09

更新时间： 2024-01-28 02:55:13

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器开关
页数	文件大小	规格书
16页	374K
描述
350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs

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LM3407_09 数据手册

January 21, 2009

LM3407

350 mA, Constant Current Output Floating Buck Switching

Converter for High Power LEDs

General Description

Features

The LM3407 is a constant current output floating buck switch-

ing converter designed to provide constant current to high

power LEDs. The device is ideal for automotive, industrial and

general lighting applications. The LM3407 has an integrated

power N-MOSFET that makes the application solution com-

pact and simple to implement. An external 1% thick-film re-

sistor allows the converter output voltage to adjust as needed

to deliver constant current within 10% accuracy to a serially

connected LED string of varying number and type. Converter

switching frequency is adjustable from 300 kHz to 1 MHz. The

LM3407 features a dimming input to enable LED brightness

control by Pulse Width Modulation (PWM). Additionally, a

separate enable pin allows for low power shutdown. An ex-

posed pad eMSOP-8 package provides excellent heat dissi-

pation and thermal performance. Input UVLO and output

open-circuit protection ensure a robust LED driver solution.

Input operating range 4.5V to 30V

■

Output voltage range: 0.1V_INto 0.9V_IN

Accurate constant current output

Independent device enable (CMOS compatible) and PWM

dimming control

Converter switching frequency adjustable from 300 kHz to

1 MHz

■

No external control loop compensation required

■

Supports ceramic and low ESR output capacitors

Input Under Voltage Lock Out (UVLO)

Thermal shutdown protection

eMSOP-8 Package

■

Applications

LED Driver

■

Constant Current Source

Automotive Lighting

General Illumination

Industrial Lighting

■

Typical Application

30046635

300466

www.national.com

12 3 4 5 6 7...16

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