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RT8543 是一款高效率白光 LED 驱动器，专为采用 LED 阵列作为光源的 LCD 面板而设计。集成式开关电流模式升压控制器可并联驱动六串 LED，且每串最多支持 10 颗 LED。内部电流灌入器支持最大 ±2% 电流匹配，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。RT8543 具备 2.5V 至 24V 的宽输入电压范围，并提供 5mA 至 50mA 的可调式 LED 电流。内部 200mΩ、43V 功率开关搭配电流模式控制，可提供逐周期过电流保护。RT8543 亦集成 PWM 与模拟调光功能，可精准控制 LED 电流。输入 PWM 调光频率可在 100Hz 至 20kHz 范围内运行，且不会在 LED 或电感中产生任何浪涌电流。RT8543 采用薄型 WQFN-20L 4x4 与 UQFN-20L 4x4 封装。
/content/dam/richtek-eds/resources/product-specifications/rt85/rt8543/images/circuit/67105zulqn.GIF
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<li class="mv5"> Wide Input Voltage : V<sub>IN</sub> 2.5V to 24V<br /></li><li class="mv5"> High Output Voltage : V<sub>OUT</sub> up to 43V<br /></li><li class="mv5"> Current Mode Boost Regulator<br />► 600kHz to 1.2MHz Switching Frequency<br />► Up to 85% High Frequency<br /></li><li class="mv5"> Adjustable Full Channel Current from 5mA to 50mA and Matched to 2%<br /></li><li class="mv5"> Channel Current Regulation with ±3% Accuracy<br /></li><li class="mv5"> Dimming Controls<br />► Direct PWM Dimming up to 20kHz and Minimum On-Time to 500ns<br />► PWM to Analog Dimming up to 20kHz with 8 bit resolution<br /></li><li class="mv5"> Built-In Soft-Start to Prevent Inrush Current without External Capacitor<br /></li><li class="mv5"> Disconnects LED in Shutdown<br /></li><li class="mv5"> Protection<br />► Strings Open Detection<br />► Current Limit Protection<br />► Adjustable Over-Voltage Protection<br />► Over-Temperature Protection<br /></li><li class="mv5"> 20-Lead WQFN and UQFN Package<br /></li><li class="mv5"> RoHS Compliant and Halogen Free</li>
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<li class="mv5"> UMPC and Notebook Computer Backlight</li>
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