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Review schematic and layout before send to UL test labs

Son Nguyen Ngoc
Prodigy 160 points

Dear Sir,

I have power supply design that have been using UCC28740 and  the design is base on one of TI reference design.

Could you help me review schematic, layout of it and give me some comments to pass UL certification ?

  • 0
    TI__Guru* 85616 points

    Hello Nguyen,

    This is not a service generally provided by TI.  However, I will try to make some recommendations. 

    To meet UL the design needs to meet creep edge and clearance specifications.

    1. Primary to secondary 8 mm, 4 mm air gap.

    2. Isolation transformers must be design for reinforced isolation 4.5 kVA

    3. You can use component (FET, Diode) ratings and lead spacing's as guide to how far apart the traces should be.

    4. The PCB needs to be made of material that meets UL94V-0

    Please note to other e2e members if I had missed something or you have something further to add please feel free to respond.

    Regards,

    Mike

  • 0 in reply to Mike O'
    Prodigy 160 points
    Hi Mike,

    Thank you very much and hope to hear more from you.

    Best regards,
    Son
  • 0 in reply to Son Nguyen Ngoc
    TI__Guru* 85616 points
    Hello Son,

    I hope my suggestions helped.

    Regards,

    Mike