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UCC28780的RUN脚无输出,求教

目前的状态是参考“”原理图设计,变压器没安装,因此VDD供电我直接用直流源给20V到芯片VDD脚,测量Vref=5V,但是Vrun=0V,即RUN脚无输出,PWM也没有输出。请教怎么解决?