AAT1451主要特性:

• VIN Range: 5V to 26V

• Integrated 50V Boost Converter

▪ Maximum IOUT: 120mA

▪ Programmable Switching Frequency

• 600kHz to 1MHz

▪ Up to 93% Efficiency

▪ High Efficiency Light-Load Mode

• Four White LED Strings

▪ Programmable Max Current Sink up to 30mA Each

▪ ±2% Accuracy (22mA)

▪ ±1.5% Matching (22mA)

• Direct PWM Dimming

▪ Automatic Phase Shifting

▪ Fast Turn-On/Off

• Integrated Fault Protection for

▪ Independent Disable of Open/Shorted LED(s) String(s)

▪ Over-Voltage

▪ Over-Temperature

• FAULT Indication for Shorted LED(s) and Over-Temperature

• Soft-Start Minimizes Inrush Current

• TDFN34-16 Low Profile Package

• -40℃ to +85℃ Temperature Range

AAT1451應用:

• Monitors

• Notebook and Netbook Computers

• Portable DVD Players

• Portable TV

• White LED Backlight

圖1.AAT1451方框圖

圖2.AAT1451典型應用電路圖

圖3.AAT1451評估板電路圖
AAT1451評估板材料清單:

AAT1451評估板表面安裝電感:

AAT1451評估板表面安裝電容:


圖4.AAT1451評估板PCB布局圖
Analogic公司的AAT1451是四路高集成高效白光LED驅動器,主要用于筆記本電腦,上網本,監視器和手提TV的LCD背光的LED驅動.器件的輸入電壓從5V到26V,可從DC,點煙適配器或多個鋰電池輸入,集成的升壓轉換器提供高達50V的輸出,每串LED電流高達30mA可編程,120mA總輸出電流可驅動多達481個LED.效率高達93%,主要用在監視器, 筆記本和上網本電腦,手提DVD播放器,手提TV和白光LED背光.本文介紹了AAT1451主要特性, 方框圖, 典型應用電路圖以及評估板電路圖和材料清單, PCB布局圖.