LM3424BSTEVAL National Semiconductor, LM3424BSTEVAL Datasheet

LM3424BSTEVAL

Manufacturer Part Number

LM3424BSTEVAL

Description

LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs; Qty per Container: 1/

Manufacturer

National Semiconductor

Datasheet

1.LM3424BSTEVAL.pdf (50 pages)

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Constant Current N-Channel Controller with Thermal

Foldback for Driving LEDs

General Description

The LM3424 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. In addition, the

LM3424 includes a thermal foldback feature for temperature

management of the LEDs. This flexibility, along with an input

voltage rating of 75V, makes the LM3424 ideal for illuminating

LEDs in a 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 LM3424 uses standard peak current-mode control

providing inherent input voltage feed-forward compensation

for better noise immunity. It is designed to provide accurate

thermal foldback with a programmable foldback breakpoint

and slope. In addition, a 2.45V reference is provided.

The LM3424 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 and external synchronization is possible.

The controller is capable of high speed PWM dimming and

analog dimming. Additional features include slope compen-

sation, softstart, over-voltage and under-voltage lock-out, cy-

cle-by-cycle current limit, and thermal shutdown.

The LM3424Q is an Automotive Grade product that is AEC-

Q100 grade 1 qualified.

Typical Boost Application Circuit

300857

300857k9

LM3424

Features

■

Applications

■

LM3424Q is an Automotive Grade product that is AEC-

Q100 grade 1 qualified (-40°C to +125°C operating

junction temperarure)

High-side adjustable current sense

2Ω, 1A Peak MosFET gate driver

Input under-voltage and output over-voltage protection

PWM and analog dimming

Cycle-by-cycle current limit

Programmable slope compensation

Programmable, synchronizable switching frequency

Programmable thermal foldback

Programmable softstart

Precision voltage reference

Low power shutdown and thermal shutdown

LED Drivers - Buck, Boost, Buck-Boost, and SEPIC

Indoor and Outdoor Area SSL

Automotive

General Illumination

Constant-Current Regulators

range from 4.5V to 75V

Boost Evaluation Board

9 Series LEDs at 1A

October 13, 2009

300857b6

www.national.com

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