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UCC28780: RUN引脚不能维持高电平

Part Number: UCC28780

 焊接电阻R20时,RUN引脚波形为4通道,只有一个电压尖峰上升到5V后就下降并且一直维持低电平 。不焊接R20,RUN引脚波形为4通道波形,能够实现5V,但是没有PWML(4个启动检测Brown in的PWML信号都没有) ,不知道什么原因,问问有没有遇到相似实验现象的。