本电路是基于UCC29950设计的PFC+LLC开关电源，不施加功率电只给控制电（13V）时，芯片输出驱动波形正常，比较稳定。当施加功率电后，芯片的LLC电路输出波形出现异常（见附图），波形显示输出消失时间为100ms，与手册中short fault现象吻合，经过查看，电路的VCC和VAC均正常，无过欠压，无波动。请帮忙分析造成该现象还有那些原因？
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