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UCC28630: 不能正常工作

Part Number: UCC28630

你好!

我在使用UCC28630设计PSR电源,现在遇到的问题是电路不能正常工作。电路及波形描述如下:

1、原理图:

波形:MOSFET-D

波形:UCC28630 - VDD

可以看出,DRV给出三个PULSE后不再有输出了,不清楚什么原因。请帮忙解答,谢谢!