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UC28070, 3KW PFC问题求助

目标是3KW,输出390V,现在设计的电感量是300UH,频率65K,Dmax=0.95,空载正常的,但是在90VAC下负载只能到0.3A,输出就开始慢慢下跌一直跌到IC重启。把输入电压调高,负载可以同步升高多带,带式依然带不了多少负载,到底是哪里出问题了那,我参考的是TI官网那个3KW PFC设计的,紧急求助TI技术人员,万分感谢