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UCC28951: issue with UCC28951

VENKATESWARA RAO P
Prodigy 10 points
Part Number: UCC28951

Hi 

i am facing a problem with UCC28951 design.

Its a AC to DC converter rating of 58V/40A. When i am loading more than 20A observed some disturbance in mosfet gate wave form. Please suggest what could be the problem.

Attached image.

Regards,

Venkatesh

  • 0
    TI__Mastermind 23255 points

    Hi Venkateshwar,

    Thank you for the query on UCC28951.

    Can you please check if there it has hit maximum duty cycle? Please check if the CS pin + slope compensation is hitting the 2V limit which might cause this behaviour. Also it will be helpful if you can share a copy of schematic along with design calculator to help debug this issue.

    Regards,

    Harish