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UCC28019并不能稳压



AC-DC变换  24VRMS to 36VDC,输入先用直流输入调试时稳态Vout为36,Vsense可以达到5V,但是负载调到30欧左右电压开始急剧下滑,最低到28V左右。交流调试时Vsense始终没有达到5V,24V输入时只有32多V,Vsense只有4.7左右,而且随着网压、负载的变化,输出电压变化较大,最低到24V。不知道正确的分析顺序是怎么样的,希望技术人员及发烧友给予指导,谢谢!