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LM3432 - 6-Channel Current Regulator

Description

The LM3432/LM3432B are 6-channel high voltage current regulators which provide a simple solution for LED backlight applications.

These devices incorporate six individual current regulator channels to give accurate driving current for each LED string.

The string-to-string tolerance is kept within ±2.

Features

  • Dynamic Headroom Control (DHC) output to maximize efficiency when used in conjunction with National Semiconductor's LM3430 Boost Controller for LED Backlighting Current sinking adjustable up to 40mA in each string Fast current switching slew rate, tr = 60ns typical Wide dimming ratio, up to 4000:1 with fDIM = 500Hz High LED driving voltage up to 80V ±2.0% current matching between strings Accepts both Digital and Analog dimming control LED open/short fault indication (For LM3432B, no open f.

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LM3432/LM3432B 6-Channel Current Regulator for LED Backlight Application www.DataSheet4U.com May 22, 2008 LM3432/LM3432B 6-Channel Current Regulator for LED Backlight Application General Description The LM3432/LM3432B are 6-channel high voltage current regulators which provide a simple solution for LED backlight applications. These devices incorporate six individual current regulator channels to give accurate driving current for each LED string. The string-to-string tolerance is kept within ±2.0%. Additionally, the Dynamic Headroom Control output can communicate with a LM3430 boost regulator to adjust the LED supply voltage to the lowest level needed to keep the string current in regulation, yielding optimal overall system efficiency.
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