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UCC28070上主电调试没驱动

Other Parts Discussed in Thread: UCC28070

上主电200VAC,UCC28070芯片没起来,测得Vsense=2V,Vinac=2V,VAO=5V,Vss=6V,芯片启动的条件都满足了,为什么还是不工作?

以前只上控制电,通过分压电阻令Vsense=2V,Vinac=1V,可以测得最大占空比情况下的驱动波形,为什么上主电就没有波形了?