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UCC3895上电击穿

Other Parts Discussed in Thread: UCC3895

请问各位高手和专家,我正在用UCC3895做逆变项目,原理图参考设计参考TI的资料。UCC3895外接12.5V供电,用电流模式,EAP外接电阻分压电位为2.5V,  主电源接50V直流电,这时板子能正常工作,波形正常。但是主电源接交流220V整流得300V直流电,再UCC3895接12.5V时,UCC3895的VCC马上击穿.

本人是新手,请高人帮分析一下原因,谢谢!