Datasheet > LM3429

LM3429

更新时间： 2024-10-02 05:42:03

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
34页	1019K
描述
N-Channel Controller for Constant Current LED Drivers

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LM3429 数据手册

August 3, 2009

LM3429

N-Channel Controller for Constant Current LED Drivers

General Description

Features

The LM3429 is a versatile high voltage N-channel MosFET

controller for LED drivers . It can be easily configured in buck,

boost, buck-boost and SEPIC topologies. This flexibility,

along with an input voltage rating of 75V, makes the LM3429

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

applications.

V_INrange from 4.5V to 75V

■

Adjustable current sense voltage

High-side current sensing

2Ω, 1A Peak MosFET gate driver

Input under-voltage protection

Over-voltage protection

PWM dimming

■

Adjustable high-side current sense voltage allows for tight

regulation of the LED current with the highest efficiency pos-

sible. The LM3429 uses Predictive Off-time (PRO) control,

which is a combination of peak current-mode control and a

predictive off-timer. This method of control eases the design

of loop compensation while providing inherent input voltage

feed-forward compensation.

Analog dimming

Cycle-by-cycle current limit

Programmable switching frequency

Thermal Shutdown

The LM3429 includes 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 frequen-

cies of up to 2.0 MHz, thus enabling compact solutions.

Additional features include analog dimming, PWM dimming,

over-voltage protection, under-voltage lock-out, cycle-by-cy-

cle current limit, and thermal shutdown.

TSSOP EP 14-lead package

Applications

LED Drivers

■

Constant-Current Buck-Boost (or Flyback) Regulator

■

Constant-Current Boost Regulator

The LM3429 comes in a low profile, thermally efficient TSSOP

EP 14-lead package.

Constant-Current Buck Regulator

Constant-Current SEPIC Regulator

Thermo-Electric Cooler (Peltier) Driver

■

Typical Application Circuit

30094422

Boost LED Driver

300944

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