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　　AnalogicTech公司的AAT1409是高度集成高效率的'八路led背光驅(qū)動器，集成了升壓轉(zhuǎn)換器（輸出高達(dá)45V）和高頻PWM調(diào)光。AAT1409的VIN范圍4.5V到 5.5V / 5.0V到26.0V，每路的電流可編程達(dá)45mA，總輸出電流360mA，可支持881個(gè)白光LED。效率高達(dá)92%，每路電流精度±2%，路間電流匹配±2%，調(diào)光范圍1，000:1，主要用在監(jiān)視器，筆記本電腦，手提TV，手提DVD播放器和白光LED背光。本文介紹了AAT1409主要特性，功能方框圖，典型應(yīng)用電路圖以及AAT1409IMK評估板電路圖和采用主從配置的288個(gè)LED應(yīng)用電路。8 ChannEL LED Backlight Driver with Integrated Boost and HighFrequency Direct PWM DimmingThe AAT1409 is a highly integrated， high efficiency LED backlightsolution for notebook computers， monitors and portable TVs. Thedevice operates from DC inputs， cigarette lighter adapters， ormulti-cell Li-ion batteries over the 4.5V to 26V voltage range.An integrated boost (step-up) converter provides up to 45V outputfor driving series LEDs. Eight precision current sinks areprogrammed up to 45mA per string through one external RSETresistor， supporting up to 881 white LEDs at 360mA total outputcurrent.LED strings may be disabled or operated in parallel for increaseddrive capability.

　　The boost output voltage is set by the LED stringwith the highest voltage requirement， allowing a wide range of LEDcharacteristics.The PWM dimming range at 100Hz is up to 1，000:1. The boostswitching frequency is selectable (up to 1.3MHz) to allow optimumefficiency and the smallest external L/C filtering components.Alternatively， the device may be synchronized to an external clock.Boost current mode control provides fast response to line and loadtransients. Integrated Light-Load mode ensures highest efficiencyacross the entire load ra

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