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UCC28750: Modifying UCC28750EVM-071 design to take 1200VDC input

Adam Doyle
Prodigy 60 points
Part Number: UCC28750
Other Parts Discussed in Thread: UCC28704, UCC28742, UCC28722

Tool/software:

Hi,

I would like to use the UCC28750EVM-071 design as a starting point for a high input voltage, isolated, DC-DC converter. Input voltage range = 200Vdc - 1200Vdc, output voltage = 24V, max output current = 1.87A. Aside from the obvious component voltage rating modifications what other modifications would need to be made to the UCC28750EVM-071 design to meet this higher input voltage requirement?

  • 0
    Prodigy 60 points

    Also, if there is a component that is better suited for this application, I am all ears.

  • +1 in reply to Adam Doyle
    TI__Guru* 85826 points

    Hello,

     

    6 to 1 is quite a large variation in input voltage.  You might be better designing with a DCM flyback converter that uses variable frequency.  You can do this with a primary side regulated UCC28704 or a UCC28742.

     

    The following link will bring you to an application note that describes how to design a flyback converter for a wide input range using the UCC28722 controller.  However, this same technique applies to the UCC28742 and UCC28704.

    https://www.ti.com/lit/pdf/slua781

     

    If you need further help with either of these devices please repost in the e2e with the part number in the thread title so the appropriate applications engineer can help you with your design.

     

    Regards,