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AS3812

Highly Accurate 16-Channel Integrated Current Sinks for LED Backlighting in 4K Ultra HD and HDR LCD Display Applications

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Individual and Global Dimming Capable for Uniform Brightness Control

The AS3812 LED driver for LCD backlighting integrates 16 highly accurate current sinks with digital control technology to improve brightness control for 4K and HDR LCD displays. Absolute current accuracy of better than +/-1% combined with high resolution dimming control allows for the highest brightness uniformity across the panel.

The AS3812 offers 12-bit individual dimming control. This feature reduces power consumption and increases contrast ratio through optimized local dimming. A single, 10-bit global dimming control also provides uniform brightness control over the full panel.

Enhanced DC/DC feedback control for up to two external DC/DC converters controlled by an SPI bus and a full array of protection features makes the AS3812 flexible and fully protected for any LCD display system.

Lifecycle status

● Active

Features

16-channel LED driver with internal current sink MOSFET

Integrated current setting resistors for lower BOM cost

30V maximum output voltage per channel

Highly accurate absolute current accuracy of ±1%

Individual 12-bit PWM for each output and one 10-bit global analog dimming control

  • Improves contrast ratio and saves power via local dimming

Comprehensive protection features:

  • Individual LED short protection
  • External reset input – holds outputs off until system is ready
  • Register Lock/Unlock
  • LED open-fault detection
  • Over-temperature protection

SPI daisy-chain interface simplifies design when supporting more than 16 LED strings

3 SPI communication protection modes in one LED driver

Internal PLL ensures jitter-free operation even with noisy VSYNC signal

Applications

LCD Backlighting for Ultra HD/4K HDR TVs

HDR Notebooks/Monitor Displays

Block Diagrams

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Functional Block Diagram

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Typical Applications Diagram

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Product Briefs and Summaries
Name Date Version
AS3812 Product Summary (452.18 KB) 19/12/2019 1.01