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RT8575 是一款支援40V I/O 介面的高效率 LED 驅動器,設計用於驅動一個 LED 陣列作為 LCD 屏的背光源。它包含一個電流模式 Boost 轉換器,用於驅動多達4個並聯連接的 LED 串,每串 LED 可以是多達18只 LED 的串聯,與每串 LED 連接的電流源的吸入电流匹配誤差在最大 ±1% 以內,確保各 LED 串之間的亮度一致性。為了給電流源吸入电流的操作預留足夠的空間,Boost 控制器對各個回饋引腳中的最低電壓進行監測並進行調節,同時確保得到一個最優的轉換效率。RT8575 的輸入電壓範圍為 4.2V~24V ,可輸出 50mA~150mA 可調的 LED 電流,其內部功率開關的導通電阻為 150mΩ ,耐壓為 60V ,工作在電流模式的控制器提供逐週期的過流保護,集成化的 PWM 調光功能可實現精確的 LED 電流控制。 PWM 輸入調光信號的頻率範圍可在 120Hz~1kHz 之間進行選擇,調光過程不會導致 LED 上的衝擊電流和電感上的衝擊電流。功率開關的切換頻率也是可調的,其範圍為 150kHz~500kHz,這使得效率和元件尺寸的選擇可以很靈活。RT8575 的封裝有 WDFN-16L 和 DIP-16(BW) 兩種可供選擇。
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<div class="spec-list"><ul class="lv1"><li>輸入電壓範圍:4.2V~24V </li><li>最高輸出電壓:60V </li><li>可調工作頻率範圍: 150kHz~500kHz </li><li>支持多達4串 LED 負載 </li><li>1% 的 LED 電流精度 </li><li>1% 的 LED 電流一致性 </li><li>可程式設計過壓保護 </li><li>內建軟啟動、過溫保護功能 </li><li>LED 短路/開路檢測 </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>White LED Backlighting </li></ul></div>
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