LM3429MH+ National Semiconductor, LM3429MH+ Datasheet

LM3429MH+

Manufacturer Part Number

LM3429MH+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM3429MH.pdf (34 pages)

Specifications of LM3429MH+

Notes

NEW

Date_code

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N-Channel Controller for Constant Current LED Drivers

General Description

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.

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.

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.

The LM3429 comes in a low profile, thermally efficient TSSOP

EP 14-lead package.

Typical Application Circuit

300944

Boost LED Driver

LM3429

Features

■

Applications

■

Adjustable current sense voltage

High-side current sensing

2Ω, 1A Peak MosFET gate driver

Input under-voltage protection

Over-voltage protection

PWM dimming

Analog dimming

Cycle-by-cycle current limit

Programmable switching frequency

Thermal Shutdown

TSSOP EP 14-lead package

LED Drivers

Constant-Current Buck-Boost (or Flyback) Regulator

Constant-Current Boost Regulator

Constant-Current Buck Regulator

Constant-Current SEPIC Regulator

Thermo-Electric Cooler (Peltier) Driver

range from 4.5V to 75V

August 3, 2009

www.national.com

30094422

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