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UCC28C40-Q1无法输出PWM波,Vref引脚电压只有不到1V。

你好,

利用Power Designer设计了一种14~130V输入,24V输出的变压器电路,根据电路制作出来之后,输入电压给到20V后,VDD引脚只有6.76V,VREF引脚只有0.6V,OUT引脚没有波形输出。变压器次级线圈没有电压。这中现象的原因是什么?

这是参考的电路设计:

webench.ti.com/.../39

谢谢