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UCC28950轻载电压跌落



本人设计一款电源:350~750DC输入,输出28V 120A  变压器PQ50  28:2  电感PQ32-40 30uH  频率80KHz   通过副边电流检测。

问题点:输入380VDC,输出空载时电压正常28V,驱动Vgs如下图1  Vds如图2   但是带载以0.2A时,电压跌落到10V。

求助是什么原因导致空载都无法正常工作,谢谢!