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RT8420是一款高效率的電流連續模式電感降壓轉換器,被設計用於從比LED串電壓高的電壓源對單只或多隻串聯連接的LED進行驅動,其工作電壓範圍是7V-50V,採用滯回式控制方式,使用高端電流檢測電阻對流過LED的電流進行參數設定。RT8420採用功率開關在低端、輸出電流檢測在高端的電路結構,只需一隻外接電阻即可對需要的平均輸出電流進行設定。LED的亮度可通過類比調光信號進行控制,當亮度百分比較低時,最高開關工作頻率會受到限制。RT8420採用具有外露散熱焊盤的MSOP-8和PSOP-8封裝,具有很好的散熱能力。
輸入電壓範圍:7V至50V
採用高端電流檢測方式的滯回式控制技術
內部N-MOSFET的RDS(ON)為350mΩ
1.2A輸出能力
效率高達97%
LED電流精準度為±5%
通過ADJ引腳進行模擬調光和PWM調光
調光至低端時對最高開關工作頻率進行限制
輸入欠壓鎖定保護
熱關機保護
符合RoHS規範,不含鹵素
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