LM3431

更新时间： 2024-10-02 04:18:51

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器控制器
页数	文件大小	规格书
24页	539K
描述
3-Channel Constant Current LED Driver with Integrated Boost Controller

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LM3431 数据手册

December 20, 2007

LM3431/LM3431A

3-Channel Constant Current LED Driver with Integrated

Boost Controller

General Description

The LM3431 is a 3-channel linear current controller combined

with a boost switching controller ideal for driving LED back-

light panels in space critical applications. The LM3431 drives

3 external NPN transistors or MOSFETs to deliver high ac-

curacy constant current to 3 LED strings. Output current is

adjustable to drive strings in excess of 200 mA. The LM3431

can be expanded to drive as many as 6 LED strings.

Features

3-channel programmable LED current

■

High accuracy linear current regulation

Analog and digital PWM dimming control

Up to 25kHz dimming frequency

>100:1 contrast ratio

Integrated Boost controller

The boost controller drives an external NFET switch for step-

up regulation from input voltages between 5V and 36V. The

LM3431 features LED cathode feedback to minimize regula-

tor headroom and optimize efficiency.

5V-36V input voltage range

Adjustable switching frequency up to 1MHz

LED short and open protection

Selectable fault shutdown or automatic restart

A DIM input pin controls LED brightness from analog or digital

control signals. Dimming frequencies up to 25 kHz are pos-

sible with a contrast ratio of 100:1. Contrast ratios greater than

1000:1 are possible at lower dimming frequencies.

Programmable fault delay

Programmable cycle by cycle current limit

Output Over Voltage Protection

The LM3431 eliminates audible noise problems by maintain-

ing constant output voltage regulation during LED dimming.

Additional features include LED short and open protection,

fault delay/error flag, cycle by cycle current limit, and thermal

shutdown for both the IC and LED array. The enhanced

LM3431A features reduced offset voltge for higher accuracy

LED current.

No Audible Noise

Enable pin

LED Over-Temperature shutdown input

Thermal Shutdown

■

TSSOP-28 exposed pad package

■

Applications

Automotive Infotainment Displays

■

Small to Medium Format Displays

Typical Application Circuit

30041101

300411

www.national.com

12 3 4 5 6 7...24

中文翻译

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与LM3431相关器件

型号	品牌	获取价格	描述	数据表
LM3431_08	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431_09	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM343-100.00M	CONNOR-WINFIELD	获取价格	LVDS Output Clock Oscillator, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC PACKAGE
LM343-155.52M	CONNOR-WINFIELD	获取价格	5.0x7.0mm Surface Mount LVDS Clock Oscillator Series
LM3431A	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431AMH	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431AMH/NOPB	TI	获取价格	具有集成升压控制器的 3 通道恒流 LED 驱动器 \| PWP \| 28 \| -40 to
LM3431AMHX	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431AMHX/NOPB	TI	获取价格	具有集成升压控制器的 3 通道恒流 LED 驱动器 \| PWP \| 28 \| -40 to
LM3431AQ	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller

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