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LM3424

National Semiconductor
Part Number LM3424
Manufacturer National Semiconductor
Description Constant Current N-Channel Controller
Published Sep 11, 2009
Detailed Description LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs www.DataSheet4U.com August 22, 200...
Datasheet PDF File LM3424 PDF File

LM3424
LM3424

Overview
LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs www.
DataSheet4U.
com August 22, 2009 LM3424 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 very diverse, large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible.
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 frequencies 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 compensation, softstart, over-voltage and under-voltage lock-out, cycle-by-cycle current limit, and thermal shutdown.
Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ VIN range from 4.
5V to 75V 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 Applications ■ ■ ■ ■ ■ LED Drivers - Bu...


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