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AS3822 LED Driver

8 Channel White LED Controller for LCD Backlight

The AS3822 is a 8 channel precision LED controller for use in LCDbacklight panels. Dynamic power feedback controls the external power supply to guarantee best efficiency. Build in safety features include thermal shutdown as well as open and short LED detection. The device is programmable via serial interface.

Block diagram of the AS3820 LED Driver

(Click to Enlarge)

Key Features

  • 8 Channel LED driver
  • Output voltage only limited by external transistor
  • Output current only limited by external transistor
  • Linear current setting using 10-bit DAC
  • Current accuracy ±0.5% @ VDAC=250mV

AS3820 Applications

LED Backlighting for LCD TV Sets and Monitors

AS3822 Product Facts

Outputs [#] 8
LED current per output [mA] depends on external FET
Features Enhanced digital feedback, 3D, DPLL
Error detection
Read-back
LED-to-LED matching [%] 0.2
Supply voltage [V] 4.0-5.5
Package QFN32 (5x5)-0.5p
TQFP32 (7x7)-0.8p