AS3693B: 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.

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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
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AS3693B Product Facts

Outputs [#]16
LED current per output [mA]Limited by external FET
FeaturesSlew rate contr.
Error detection
LED-to-LED matching [%]0.5
Supply voltage [V]Main Supply
PackageepTQFP64 (10x10)-0.5p QFN64 (9x9)-0.5p