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在光伏輸出光耦中,由LED發出的光通過光電二極體陣列(PDA)所吸收並轉化為輸出電壓。
光伏輸出光耦可以應用于創造一個MOSFET柵極驅動器,而無需使用外部次級電源。
東芝提供通用型光伏輸出光耦和具有內部並聯電阻(用於柵極電容放電)的光耦。
◆具有內部並聯電阻
在光伏輸出光耦中,由LED所發射出的光通過PDA所接收並轉化成用於驅動MOSFET柵極的電壓。因為光耦的輸入(LED)側和輸出(PDA)側相互電隔離,這就降低了從MOSFET側至CPU側進行傳輸時所產生的噪音。
TLP3914 IF-VOC Characteristics
用於降低噪音的MOSFET柵極驅動實例
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