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RT7255是簡單易用的1.5A同步Buck轉換器,輸入電壓範圍為4.3V至18V,內建0.6V高精度參考電壓,集成低RDS(ON)功率MOSFET開關,轉換效率高,使用TSOT-23-8封裝。RT7255使用改進型固定導通時間 (ACOT™) 控制架構,具有超快速瞬態回應能力,週邊元件少,在全輸入電壓、負載和輸出電壓下的工作頻率保持基本恒定。RT7255A在輕載條件下自動進入PSM工作模式以維持高效率工作,RT7255C則工作在強制PWM模式下以滿足高輸出電壓精度的要求。RT7255通過檢測下橋開關電流實現過流保護功能,具備逐週期電流限制保護能力,可在輸出短路、過流或電感飽和等嚴峻狀態下確保器件安全,另有外部可調的軟啟動功能避免出現啟動器件的電流衝擊,還有輸入欠壓鎖定、輸出欠壓保護、過熱保護 (熱關機) 等確保其在各種條件下都能安全工作。
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