Datasheet > LM3421

LM3421

更新时间： 2024-11-23 04:44:27

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
22页	880K
描述
N-Channel Controllers for Constant Current LED Drivers

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LM3421 数据手册

July 31, 2008

LM3421, LM3423

N-Channel Controllers for Constant Current LED Drivers

General Description

Features

The LM3421/LM3423 devices are versatile high voltage LED

driver controllers. With the capability to be configured in a

Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and

an input operating voltage rating of 75V, these controllers are

ideal for illuminating LEDs in a very diverse, large family of

applications.

V_INrange from 4.5V to 75V

■

2% Internal reference voltage (1.235V)

Current sense voltage adjustable from 20mV

High-side current sensing

2Ω MOSFET gate driver

■

Dimming MOSFET gate driver

Input under-voltage protection

Over-voltage protection

Adjustable high-side current sense with a typical sense volt-

age of 100mV allows for tight regulation of the LED current

with the highest efficiency possible. Output LED current reg-

ulation is based on peak current-mode control with predictive

Off-Time Control. This method of control eases the design of

loop compensation while providing inherent input voltage

feed-forward compensation.

Low shutdown current, I_Q< 1µA

Fast (50kHz) PWM dimming

Cycle-by-cycle current limit

The LM3421/LM3423 include a high-voltage startup regulator

that operates over a wide input range of 4.5V to 75V. The

internal PWM controller is designed for adjustable switching

frequencies of up to 2.0MHz, thus enabling compact solu-

tions. Additional features include: “zero” current shutdown,

precision reference, logic compatible DIM input suitable for

fast PWM dimming, cycle-by-cycle current limit, and thermal

shutdown.

Programmable switching frequency

LED output status flag (LM3423 only)

Fault timer pin (LM3423 only)

TSSOP EP 16-lead package (LM3421)

TSSOP EP 20-lead package (LM3423)

Applications

The LM3423 also includes an LED output status flag, a fault

flag, a programmable fault timer, and a logic input to select

the polarity of the dimming output driver.

LED Drivers

■

Constant-Current Buck-Boost Regulator

Constant-Current Boost Regulator

Constant-Current Flyback Regulator

Constant-Current SEPIC Regulator

Thermo-Electric Cooler (Peltier) Driver

Typical Application Circuit

30067331

Boost LED Driver

300673

www.national.com

12 3 4 5 6 7...22

中文翻译

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与LM3421相关器件

型号	品牌	获取价格	描述	数据表
LM3421_09	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421_10	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421_11	NSC	获取价格	LM3421 SEPIC LED Driver Evaluation Board for Automotive Applications
LM342-100.000M	CONNOR-WINFIELD	获取价格	Oscillator
LM342-100.00M	CONNOR-WINFIELD	获取价格	LVDS Output Clock Oscillator, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC PACKAGE
LM342-155.52M	CONNOR-WINFIELD	获取价格	5.0x7.0mm Surface Mount LVDS Clock Oscillator Series
LM3421MH	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421MH/NOPB	TI	获取价格	具有串联 DIM FET 驱动器的 N 沟道恒流 LED 驱动器控制器 \| PWP \| 1
LM3421MHX	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421MHX/NOPB	TI	获取价格	具有串联 DIM FET 驱动器的 N 沟道恒流 LED 驱动器控制器 \| PWP \| 1

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