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UCC256301芯片用WEBENCH®︎ Power Designer设计的电路问题

Other Parts Discussed in Thread: UCC256301

UCC256301芯片WEBENCH® Power Designer设计,不能正常工作,

VCR引脚,在没有启动时(欠压)电压=3V,非欠压时的波形(下管驱动)如下图:

万用表测量VCR的电压高至7V,

注,器件参数按照WEBENCH设计文档取值

请问这是什么原因?

谢谢大家