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Ucc28780啟動問題

Other Parts Discussed in Thread: UCC28780, UCC27712我想請問為什麼在我ic啟動後(VDD閾值為17.5v),此時ref值為5V,但我的run接腳卻沒有訊號出來導致我沒有pen訊號輸出?我有嘗試量過RDM和RTZ都有訊號輸出HVG與SWS接腳也正常,NTC因為沒有做溫度保護直接與ref接一起。