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TPS54202: tps54202 schematic and layout revision

Emanuele Peruzzi
Intellectual 610 points
Part Number: TPS54202

Tool/software:

Hello team,

i made a board based onto tps54202 device, but i can' let him switch, it is not working at all, can i ask for a layout and schematic revision??

ac250a.pdf

ac250a.zip

Kind Regards

Emanuele Peruzzi

  • +1
    Intellectual 610 points

    I found the problem,

    which was leaving the enable pin floating. Despite the datasheet says to leave the en unconnected for enabling, it simple does not work, tying EN to Vin with a voltage divider, makes the regulator switching properly

    Kind Regards

  • 0 in reply to Emanuele Peruzzi
    TI__Mastermind 26296 points

    Hi Emanuele

    Thank you for your update. Glad to see that the issue is gone.

    But the TPS54202 should be able to enable when EN floating. You can probe on EN pin and check the voltage, see if it is >1.21V . And check is there any chance it's pulled down by some other circuit on the board? You can also replace a new device and see if it works.

    Can you please share the PCB file instead of gerber file?

    Thank you

  • 0 in reply to Gui He
    Intellectual 610 points

    Hello gui,

    thanks for helping, unfortunately i don t have any pcb file, i only have .cam, which can be opened with camvu.

    ac250a-cam.zip

    Thanks

  • 0 in reply to Emanuele Peruzzi
    TI__Mastermind 26296 points

    Hi Emanuele

    Sorry that it's hard to recognize the components in the gerber file. But anyway, pcb layout might not be reason for this phenomenon. You can add the layout image if you want me to check.

    The TPS54202 should be able to enable when EN floating. How many test board do you have and does that happen on all boards?

    Thanks and best regards.

  • 0 in reply to Gui He
    Intellectual 610 points

    Hello Gui,

    thanks again for your support, i append the photo of the board.

    this is the part regarding the regulator. The black silk makes hard to see copper under it..

    This is happening on two boards, i have only 2 to test unfortunately. As i say i solver adding a voltage divider to pull up the en pin.

    regards

    Emanuele Peruzzi