AS3834: 4 Channel High-Precision LED Controller for 3D-LCD Backlight With Integrated Step-Up Controller

The AS3834 is a 4 channel high precision LED controller with 4 PWM input for driving external bipolar transistors in LED backlight panels, also optimized for 2D and 3D operation in TV applications. The integrated step-up controller provides the necessary output voltage for the LED string supply. The SMPS feedback control optimizes the power efficiency by adjusting the LED string supply voltage. Build in safety features include under-voltage and thermal shutdown as well as open and short LED detection.

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Key Features

  • 4 channel LED controller
  • 4 PMW inputs
  • Temperature supervision of external BJT
  • Step-up controller optimized for 2D/3D mode
  • Supply voltage range: 12V to 50V
  • Output current up to 270mA per channel
  • Absolute current accuracy +/- 0.8%

AS3834 Applications

  • LED Backlighting for 3D-LCD Backlight TV Sets and Monitors
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AS3834 Product Facts

Outputs [#]4
LED current per output [mA]270
Featuresintegrated step-up, 4 PWM inputs, use of inexpensive BJTs with BETA compensation, LED string voltage only limited by BJT rating
Error detectionLED short/open with BJT temp. supervision
LED-to-LED matching [%]0.6
Supply voltage [V]12-50