LM3431 3-Channel Constant Current LED Driver

National Semiconductor

Description

LM3431/LM3431A/LM3431Q/LM3431AQ 3-Channel Constant Current LED Driver with Integrated Boost Controller LM3431/LM3431A/LM3431Q/ LM3431AQ www.DataShee.
The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critica.

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Datasheet Specifications

Part number: LM3431
Manufacturer: National Semiconductor
File Size: 621.22 KB
Datasheet: LM3431_NationalSemiconductor.pdf
Description: 3-Channel Constant Current LED Driver

Features

* LED cathode feedback to minimize regulator headroom and optimize efficiency. A DIM input pin controls LED brightness from analog or digital control signals. Dimming frequencies up to 25 kHz are possible with a contrast ratio of 100:1. Contrast ratios greater than 1000:1 are possible at lower dimming

Applications

* The LM3431 drives 3 external NPN transistors or MOSFETs to deliver high accuracy constant current to 3 LED strings. Output current is adjustable to drive strings in excess of 200 mA. The LM3431 can be expanded to drive as many as 6 LED strings. The boost controller drives an external NFET switch fo

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LM3431 3-Channel Constant Current LED Driver National Semiconductor

National Semiconductor LM3431-like datasheet