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TPS23755: SCH check & transformer check

user5345709
Intellectual 305 points
Part Number: TPS23755

Dear TI Support team

      Pls help check the customer Design and transformer in system design is it ok?  thanks!3122.TSA115 2013-11-29.pdf

  • 0 in reply to user5345709
    TI__Mastermind 21320 points

    Hello,

    • The rating of the TVS is very important it must be the ‘58’ so that the clamping voltage is below 95V.
    • They have two 100uF input bulk caps. They only need 10uF, so they could save a lot of cost and space by changing these
    • They have no EMI choke, no ferrite beats and dithering is disabled. Their EMI/EMC will be poor with no way to adjust/improve
    • Looks like there are multiple output grounds. I would hope these are connected somewhere else on the schematic, or common mode caps between all grounds is needed.
    • Most importantly, this transformer will probably not work. The TPS23755 uses primary side regulation (PSR). This requires a special transformer stackup. Please use the transformer in the EVM, or alternatively we have an equivalent at Wurth.

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments