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RT4501 是用於背光應用的高效率 LED 驅動器,它採用集成了蕭基二極體的非同步 Boost 轉換器和電流源驅動器,可在 2.5V~5.5V 的輸入電壓範圍內支援每通道6只 LED 的應用。一個可工作在快速模式和高速模式的 I<sup>2</sup>C 介面可支援其實現對背光的控制,它可以線性映射的方式實現256級亮度調節。同時,它也支援採用 PWM 信號進行亮度調節。在亮度調節方法上,RT4501 支援以脈衝方式實現128級亮度調節,RT4501則支援以 PWM 調光方式進行256級亮度調節。RT4501 具有完善的保護功能,如輸入欠壓鎖定保護、過流、過壓保護和過溫保護。過壓保護的閾值電壓可根據不同應用的需要選擇為 16V 或 25.5V 。它的封裝是 WL-CSP-10B 0.87x2.07。
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<div class="spec-list"><ul class="lv1"><li>輸入電壓範圍:2.5V~5.5V </li><li>集成了蕭基二極體 </li><li>相容快速模式的 I<sup>2</sup>C 介面 </li><li>驅動多達7只串聯的2串 WLED </li><li>外部 PWM 或脈衝亮度控制方式 </li><li>550kHz/1MHz 開關工作頻率 </li><li>內建軟啟動功能 </li><li>PWM 調光/脈衝調光的精細度可達256/128級 </li><li>I<sup>2</sup>C 可程式設計的256級線性電流調節 </li><li>使用小型電感,效率可達85% </li><li>16V/25V可程式設計過壓保護 </li><li>電流精度:±5%;電流平衡:±3% </li><li>欠壓鎖定、過壓保護、過流保護和過溫保護 </li><li>關機電流:<1µA </li><li>使用溫度範圍:-40°C~85°C </li><li>符合 RoHS 規範,不含鹵素 </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>行動電話 </li><li>數位相機 </li><li>PDA 和智慧手機 </li><li>可擕式設備 </li></ul></div>
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