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UCC3895调试遇到的问题

Other Parts Discussed in Thread: UCC3895

辅电和开环调试都正常,开环调试给定一个固定的移相角随着输入电压的慢慢增大,输出电压也增大,但是闭环调试时发现输出电压要么4V左右,要么就115V,改变软启动时间可以改变这个输出电压,要么就是4V,要么就是115V,运放上的闭环反馈怎么调也没有用,基准2.5V是准的,我是做恒压点80V,负载为20R,拓朴为移相全桥,前面一级电路是PFC电路移相全桥的母线电压是380V左右,..现有原理图一份,不知道是哪里出了问题,请TI工程师们帮忙看看

Sheet1.rar