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摘要：  austriamicrosystems公司的AS3693B 是16路高精度LED控制器，內(nèi)置的PWM發(fā)生器用來驅(qū)動LCD屏背景光的外接FET.外接時鐘和同步輸入允許LCD背景光和TV圖像同步.輸出電壓檢測高達50V，電流絕對值的精度在±0.5%，內(nèi)置了5V旁路穩(wěn)壓器.所有的電路參數(shù)可通過I2C或SPI接口編程.本文介紹了AS3693B的主要特性和應用示意圖.

關(guān)鍵字：  LED控制器，  LCD屏，  穩(wěn)壓器

austriamicrosystems公司的AS3693B 是16路高精度LED控制器，內(nèi)置的PWM發(fā)生器用來驅(qū)動LCD屏背景光的外接FET.外接時鐘和同步輸入允許LCD背景光和TV圖像同步.輸出電壓檢測高達50V，電流絕對值的精度在±0.5%，內(nèi)置了5V旁路穩(wěn)壓器.所有的電路參數(shù)可通過I2C或SPI接口編程.本文介紹了AS3693B的主要特性和應用示意圖.

16 channel high precision LED controller for LCD backlight

The AS3693B is a 16 cannels high precision LED controller with build in PWM generators for driving external FETs in LCD-backlight panels.

External clock and synchronizing inputs allow the synchronization of the LCD backlight with the TV picture. Local dimming and scan dimming is supported by 16 independent PWM generators with programmable delay， period and duty cycle. Three free configurable dynamic power feedback circuits make the device usable for white LED as well as RGB backlights. Build in safety features include thermal shutdown as well as open and short LED detection. All circuit parameters are programmable via I2C or SPI interface.

AS3693B主要特性:

16 independent LED channels

External FET control and current sensing

Output voltage sense up to 50V

Absolute current accuracy ±0.5%

Output slew rate limited to reduce EMI

Current programmable with external resistor

16 independent PWM generators with 12 bit resolution

H-Sync， V-Sync inputs to synchronize with TVset

Three independent power feedback for R-， G-， B-supply regulation

Build in 5V shunt regulator

I2C or SPI interface with 5 bit device address

Fault interrupt output

Open LED detection

Short LED detection

Temperature shutdown

Package epTQFP64

應用:

LED Backlighting for LCD – TV Sets and Monitors

圖1. AS3693B方框圖和應用示意圖