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Document overview
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Technical content
8 channel white LED controller for LCD backlight The AS3822 is a 8 channels 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. 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
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 to 5.5 TQFP32 (7x7)-0.8p Additional Information
Applications
The AS3822 is suitable for LED backlighting for LCD such as TV sets and monitors http://ams.com/eng/Products/Power‐Management/Panel‐Backlight/AS3822 6‐12‐17