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UCC28180: 测试VCOMP时遇到问题

Part Number: UCC28180

UCC28180做的600W PFC,输出电压390V;输入电压范围110V-220V AC,工作频率100KHZ,采样电阻0.025R

在送电时无法稳压 并且输出电压持续上升 超过390V许多  VSENSE已超过5.1V

所以测试VCOMP

1.VSENSE给1.5V时 VCOMP为6V

2.VSENSE给5V时 VCOMP持续上升至6V停止

3.VSENSE给5.05V时 VCOMP为300mV

想问这样的测试方法正确吗 因为看到其他文章 VCOMP应该会在5V

附上IC周边电路图