AS3822 LED Driver
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
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 to 5.5
Package
QFN32 (5x5)-0.5p
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
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