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TPS63061: No DC output

Jack Li2
Prodigy 20 points
Part Number: TPS63061

No DC output from the TPS63061. 

Schematic and layout diagrams are attached below:

  • 0
    TI__Expert 7925 points

    Hi Jack,

    The schematic looks fine, with two remarks:

    1. Cout=10 µF is not enough. We recommend at least 44 µF.
    2. If you don't use PG output, you don't need the pull up resistor R, and you can leave PG pin open/floating.

    Please try another unit, and send us the scope plots of VIN, VOUT, L1 and L2 voltages during startup.

    I see you have a via on VIN/EN pads. Unless it is a plugged via, this is not recommended. Solder may get sucked in from the pins, leaving too little solder for a reliable connection, so I would check if VIN/EN pins are actually soldered.

    Best regards,
    Milos

  • 0
    TI__Expert 7925 points

    Hi Jack,

    Is there any update, have you been able to resolve the problem? If not, please send us the scope plots.

    Best regards,
    Milos

  • 0 in reply to Milos
    Prodigy 20 points

    Hi Milos, 

    Thanks for your solution. 

    Our engineer has add a larger cap externally and we have tried two modules, but no much luck yet. 

    The contact of VIN/EN are properly soldered.

    We are using a different DCDC converter as an alternative solution at this moment. 

     I will ask the engineer to provide the VIN, VOUT, L1 and L2 voltage shortly. 

    Thanks, 

    Jack

  • 0 in reply to Jack Li2
    TI__Expert 7925 points

    Hi Jack,

    In the meantime, could you please post the operating conditions: Vin, Vout and Iout range?

    One more remark - you should add more GND vias, especially on the GND side of C1 and C3. A good GND connection is extremely important for switch mode converters.

    Best regards,
    Milos

  • 0 in reply to Jack Li2
    TI__Expert 7925 points

    Hi Jack,

    We haven’t heard back so we're assuming this resolves your issue. If not, just post a reply below, or create a new thread if the thread has locked due to time-out.

    Thanks and regards,
    Milos