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UCC28911: The chip does not start up.

Yi Yu
Prodigy 10 points
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!

  • 0
    Prodigy 10 points

    I would like to trouble all the experts to help me analyze the reasons. I want to solve this problem as soon as possible. Thank you very much!

  • 0 回复 Yi Yu
    TI__Mastermind 21740 points

    感谢您对TI产品的关注！
    关于你的咨询，我们正在确认你的问题，稍后回复您。

  • 0 回复 Vivian Gao
    TI__Mastermind 21740 points

    What voltage are you measuring on the VDD pin? You have a lot of capacitance on the +15V rail which I suspect is not getting to 15V. The VDD pin has to exceed 10V to turn on. Also, why is R86 in the schematic?

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