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应用:

• Monitors

• Notebook and Netbook Computers

• Portable DVD Players

• Portable TV

• White LED Backlight

图1.AAT1451方框图

图2.AAT1451典型应用电路图

图3.AAT1451评估板电路图
AAT1451评估板材料清单:

AAT1451评估板表面安装电感:

AAT1451评估板表面安装电容:


图4.AAT1451评估板PCB布局图
Analogic公司的AAT1451是四路高集成高效白光LED驱动器,主要用于笔记本电脑,上网本,监视器和手提TV的LCD背光的LED驱动.器件的输入电压从5V到26V,可从DC,点烟适配器或多个锂电池输入,集成的升压转换器提供高达50V的输出,每串LED电流高达30mA可编程,120mA总输出电流可驱动多达481个LED.效率高达93%,主要用在监视器, 笔记本和上网本电脑,手提DVD播放器,手提TV和白光LED背光.本文介绍了AAT1451主要特性, 方框图, 典型应用电路图以及评估板电路图和材料清单, PCB布局图.