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UCC28730: VDD problem

KIM Andy
Expert 2530 points
Part Number: UCC28730

HI

My customer configured circuit with UCC28730.

VDD appears like a picture and the output voltage is not coming out.

What problems should you identify?

  • 0
    TI__Intellectual 880 points
    Hi KIM Andy,

    Can you please specify the input and output voltages, and some information about the transformer like the turns ratio and magnetizing inductance?

    It seems that one of the fault protections of the device is kicking in and stopping operation. Page 20 of the UCC28730 Datasheet (www.ti.com/.../ucc28730.pdf ) lists the fault protections and a description of each. One of these may be the cause of your customer's issue.

    I would recommend reviewing the document titled "Troubleshooting TI PSR Controllers" which I will link here: www.ti.com/.../slua783.pdf

    This document goes over several causes of startup/operation issues and how has guidelines on how to solve them.

    Regards,
    Davit