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UCC28780: ucc28780 frequency decrease

Sammi Shang
Expert 4450 points
Part Number: UCC28780
Other Parts Discussed in Thread: UCC28704

Dear team,

Customer want to know if they could decrease the frequency to 80KHz. Because they found the MOSFET is too hot when frequency @160KHz. And customer also want to know if the frequency will influenced by primary-side inductor?

Thanks.

Best regards,

Sammi

  • 0
    TI__Expert 8210 points

    Sammi

    Yes, you should be able to reduce the switching frequency to 80kHz.  If the customer is operating at such a low frequency, you may wan to consider alternative flyback controller such as UCC28704.

    If you change the frequency the transformer design may change as well.  You can determine how it changes by reviewing section 8.2.2.2 (page 39) of the datasheet.

    Best Regards,

    Eric