ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS3833 LED Driver

6 channel high-precision LED controller for 3D-LCD backlight with integrated step-up controller

 

The AS3833 is a 6 channel high precision LED controller with 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.

Key Features

  • 6 channel LED controller
  • Step-up controller optimized for 2D/3D mode
  • Supply voltage range: 12V to 50V
  • Output current up to 250mA per channel
  • Absolute current accuracy +/- 0.8%

Product Facts

Outputs [#] 6
LED current per output [mA] 300
Features integrated step-up,
1 PWM input with phase shift,
use of inexpensive BJTs with BETA compensation,
LED string voltage only limited by BJT rating
Error detection LED short/open with BJT temp. supervision
Read-back
LED-to-LED matching [%] 0.6
Supply voltage [V] 12 - 50
Package TQFP32 (7x7)-0.8p
SOIC28-1.27p

Additional Information

Applications

LED backlighting for 3D-LCD backlight TV sets and monitors