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RT8568A 是一款用于白光 LED 的高效率驱动器。它专为采用 LED 阵列作为光源的 LCD 面板而设计。集成式电流模式升压控制器可并联驱动六串 LED，且每串最多支持 12 颗 WLED。内部电流灌入器支持最大 ±2% 电流不匹配，可在每串 LED 中实现优异的亮度均匀性。为提供电流灌入器运行所需的足够余量，升压控制器会监测反馈引脚的最低电压，并调节优化输出电压以提升电源效率。RT8568A 具备 4.2V 至 24V 的宽输入电压范围，并可提供 5mA 至 40mA 的可调式 LED 电流。内部 250mΩ、43V 功率开关搭配电流模式控制，可提供逐周期过电流保护。RT8568A 亦集成 PWM 调光功能，可精准控制 LED 电流。输入 PWM 调光频率可在 200Hz 至 25kHz 范围内运行，且不会在 LED 电流或电感电流中产生任何浪涌电流。RT8568A 的开关频率亦可在 500kHz 至 2MHz 之间调节，可在效率与元件尺寸之间提供灵活性。RT8568A 采用薄型 WQFN-20L 4x4 封装。
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<li class="mv5"> Wide Input Voltage : 4.2V to 24V<br /></li><li class="mv5"> High Output Voltage : Up to 43V<br /></li><li class="mv5"> Channel Current Programmable : 5mA to 40mA <br /></li><li class="mv5"> Channel Current Regulation with Accuracy ±3% and Matching ±2% <br /></li><li class="mv5"> Dimming Controls : External PWM Input Up to 25kHz <br /></li><li class="mv5"> Adjustable Switching Frequency : 500kHz to 2MHz<br /></li><li class="mv5"> Built-In Soft-Start <br /></li><li class="mv5"> Protections<br />► LED Strings Open Detection<br />► Current Limit Protection<br />► Programmable Over Voltage Protection<br />► Over Temperature Protection<br /></li><li class="mv5"> 20-Lead WQFN Package <br /></li><li class="mv5"> RoHS Compliant and Halogen Free</li>
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<li class="mv5"> UMPC and Notebook Computer Backlight<br /></li><li class="mv5"> GPS, Portable DVD Backlight</li>
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