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关于UCC28950的burst ModeL期间波形紊乱的问题



我一个80V/5A的电源,在正常输出空载时,原边上的驱动波形及同组的VDS相当乱,此时的输入功率将达到15W之多,正常约7W左右,如附图,

上图为原边下管 VGS与VDS

再附上空载时的CS波形