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UCC28750: Multi output flyback converter

Jonathan Nadar
Prodigy 50 points
Part Number: UCC28750
Other Parts Discussed in Thread: UCC28730,

Tool/software:

Hi,e

I am designing a flyback converter for a motor drive application with the following specifications: 

Input: 350VDC to 850VDC, nominal 600VDC

Output 1: 18V, 1A regulated-non isolated

Output 2: 190V, 200mA unregulated-isolated

Output 3: 8V, 1A unregulated-isolated

The webench power designer does not allow me to design a multi-output flyback converter. I am new to designing flyback converters. Could you recommend me a few ICs which could work for this application? 

  • 0
    TI__Guru 50040 points

    Hi Jonathan,

    Yes. WEBENCH does not currently create multiple output designs, I am working to get than functionality added in.

    In the meantime, here is an example reference design based on the UCC28742 (PMP38031). While it is not the same power and voltage levels you are targeting, it can be a good starting point. 

    We also have PMP40163 which shows how to handle a wider input range with the UCC28730.

    The UCC28750 can also support this but the overall efficiency and light load performance will not be as good as the UCC28730 can acheive.

    I hope this answers your question.