AS3824: 16 Channel Local Dimming LED Backlight Controller

AS3824 is a 16-channel LED TV backlight controller which performs local dimming of sections of a display screen to provide both improved picture quality and valuable power savings of up to 20-30%.The new backlight controller is intended for use in the latest high-definition (HD) and ultra-high-definition (UHD, or '4K') televisions, as well as high dynamic range (HDR) monitors and displays.The AS3824 includes a fully flexible 12-bit PWM generator for each of its 16 channels, to enable sections of a display screen to be dimmed independently. Each PWM generator may be synchronized with an external synchronization signal.The local dimming enabled by the AS3824 also provides for additional system power savings compared to global backlight controllers.

Key Features

  • No limit of VLED or ILED, controller not exposed to high voltage/current
  • One global high accurate 10bit DAC which sets the LED current (+-.5% accurate)
  • 16 independent 8 bit DACs can be used to boost/decrease LED current within certain frames
  • QFN48 7x7mm with 0.5mm pitch
  • LQFP44 10x10mm 0.8mm pitch

Key Benefits

  • All LED backlight topologies
  • Optimum power savings through local dimming
  • All LED backlight topologies
  • Highest brightness uniformity
  • High Dynamic range boost function
  • Global Dimming Mode available
  • Lowest BOM
  • Two Package types available
(click to enlarge)

AS3824 Applications

  • HD TVs
  • UHD TVs
  • Monitor
  • HDR (High Dynamic Range) Monitors and Displays

AS3824 Product Facts

Outputs [#]16
LED current per output [mA]limited by external FET
FeaturesHDR support, minimum PWM on time, digital enhanced DCDC feedback
Error detection
LED-to-LED matching [%]0.2
Supply voltage [V]4-5,5
PackageQFN48 (7x7)-0.5p