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Product Spec Banner
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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。整合式开关电流模式升压控制器可并联驱动六串 LED，且每串最多支援 10 颗 LED。内部电流汲入器支援最大 ±2% 电流匹配，可在每串 LED 中实现优异的亮度均匀性。为提供电流汲入器运作所需的足够余裕，升压控制器会监测回授脚位的最低电压，并调节最佳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 亦整合 PWM 与类比调光功能，可精准控制 LED 电流。输入 PWM 调光频率可在 100Hz 至 20kHz 范围内运作，且不会在 LED 或电感中产生任何突入电流。RT8543 采用薄型 WQFN-20L 4x4 与 UQFN-20L 4x4 封装。
RT8543 电路图
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<div class="spec-list"><ul class="lv1"><li>Wide Input Voltage : V<sub>IN</sub> 2.5V to 24V </li><li>High Output Voltage : V<sub>OUT</sub> up to 43V </li><li>Current Mode Boost Regulator <ul class="lv2"> <li></li><li>600kHz to 1.2MHz Switching Frequency </li><li>Up to 85% High Frequency </li></ul> </li><li>Adjustable Full Channel Current from 5mA to 50mA and Matched to 2% </li><li>Channel Current Regulation with ±3% Accuracy </li><li>Dimming Controls <ul class="lv2"> <li></li><li>Direct PWM Dimming up to 20kHz and Minimum On-Time to 500ns </li><li>PWM to Analog Dimming up to 20kHz with 8 bit resolution </li></ul> </li><li>Built-In Soft-Start to Prevent Inrush Current without External Capacitor </li><li>Disconnects LED in Shutdown </li><li>Protection <ul class="lv2"> <li></li><li>Strings Open Detection </li><li>Current Limit Protection </li><li>Adjustable Over-Voltage Protection </li><li>Over-Temperature Protection </li></ul> </li><li>20-Lead WQFN and UQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8543 订购信息
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RT8543
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RT8543
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<div class="spec-list"><ul class="lv1"><li>UMPC and Notebook Computer Backlight </li></ul></div>
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