• Precision Measurement Technologies
  • Technology Center for

AS3693B LED Driver

16 Channel High Precision LED Controller for LCD Backlight

The AS3693B is a 16 channels high precision LED controller with built-in PWM generators for driving external FETs in LCD-backlight panels. External clock and synchronizing inputs allow the synchronization of the LCD backlight with the TV picture. Local dimming and scan dimming is supported by 16 independent PWM generators with programmable delay, period and duty cycle. Three free configurable dynamic power feedback circuits make the device usable for white LED as well as RGB backlights. Built-in safety features include thermal shutdown as well as open and short LED detection. All circuit parameters are programmable via I2C or SPI interface.

AS3693B LED Driver Block Diagram

(Click to Enlarge)

Key Features

  • 16 independent LED channels
  • External FET control and current sensing
  • Output voltage sense up to 50V
  • Absolute current accuracy ±0.5%
  • Output slew rate limited to reduce EMI

AS3693B Applications

LED Backlighting for LCD - TV Sets and Monitors

AS3693B Product Facts

Outputs [#] 16
LED current per output [mA] Limited by external FET
Features Slew rate contr.
Error detection
Read-back
LED-to-LED matching [%] 0.5
Supply voltage [V] Main Supply
Package epTQFP64 (10x10)-0.5p
QFN64 (9x9)-0.5p