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UCC28911: The chip does not start up.

Part Number: UCC28911

Hi Experts,

We have designed an auxiliary power supply using the UCC28911. Currently, the problem we are facing is that the chip does not start up. That is, the DRAIN pin has a DC voltage. The schematic diagram is as follows. I have tried adjusting the parameters of various components, but none of them have been effective. Please help me analyze this.

Thank you!