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Product Spec Banner
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RT8543 是一款高效率白光 LED 驅動器，專為採用 LED 陣列作為光源的 LCD 面板而設計。整合式開關電流模式升壓控制器可並聯驅動六串 LED，且每串最多支援 10 顆 LED。內部電流汲入器支援最大 ±2% 電流匹配，可在每串 LED 中實現優異的亮度均勻性。為提供電流汲入器運作所需的足夠餘裕，升壓控制器會監測回授腳位的最低電壓，並調節最佳化輸出電壓以提升電源效率。RT8543 具備 2.5V 至 24V 的寬輸入電壓範圍，並提供 5mA 至 50mA 的可調式 LED 電流。內部 200mΩ、43V 功率開關搭配電流模式控制，可提供逐週期過電流保護。RT8543 亦整合 PWM 與類比調光功能，可精準控制 LED 電流。輸入 PWM 調光頻率可在 100Hz 至 20kHz 範圍內運作，且不會在 LED 或電感中產生任何突入電流。RT8543 採用薄型 WQFN-20L 4x4 與 UQFN-20L 4x4 封裝。
RT8543 電路圖
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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 訂購資訊
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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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