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UCC5350-Q1: UCC5350M无法输出PWM波

Part Number: UCC5350-Q1

使用UCC5350M做图腾柱PFC,快管的上管有PWM输出,下管就没(原边3.3V供电正常,PWM信号输入正常,副边12V供电正常),下管唯一的区别就是原副边供电,当非隔离用,请问这颗芯片是不是原副边不能共地?希望能得到哪位技术大牛解答,谢谢。