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Original question:
UCC28063: UCC28063带满载电压下降，PF值飘动
请教一问题，目前我用28063调试一台1000W的PFC 输入电压在100-277V PFC电压440V 效率0.976，现遇到一个问题有几点1、在高于260V输入时开机FC电压无法正常起来，在260V以下开机能正常带载起机，输入调到高到277V均正常2、输入电压超过280V时PFC开始出现异常，只有当电压降低至255 V以下又恢复正常
HI
调整一下Vinac的参数看看。
