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AS3821 LED Driver

12 Channel LED Controller

The AS3821 is a 12 channel precision LED for use in LCD-backlight 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

  • 12 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

AS3821 Product Facts

Outputs [#] 12
LED current per output [mA] limited by external FET
Features 2 configurable supply regulation feedback outputs
Error detection
Read-back
LED-to-LED matching [%] 0,2
Supply voltage [V] 4,5-5,5
Package LQFP44 (10x10)-0.8p
QFN48 (7x7)-0.5p