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UCD3138PSFBEVM-027: Problems with UCD3138PSFBEVM-027 (AUXOUT not output)

koumei okahara
Prodigy 10 points
Part Number: UCD3138PSFBEVM-027
Other Parts Discussed in Thread: UCD3138CC64EVM-030, UCD3138, USB-TO-GPIO2

Tool/software:

I am trying to evaluate the UCD3138PSFBEVM-027, but I have two questions about it.
① I am inputting 400V, but the AUX output from PWR050 is not outputting properly, and D26 keeps flashing.
Is there a problem with the setup?
*No load is connected yet.
② I connected a USB-TO-GPIO to the UCD3138CC64EVM-030 and started "Fusion digital power studio", but the message "No Devices Found!" appears and I cannot connect.
Is there any setting that needs to be done?

  • 0
    TI__Expert 4855 points

    Hello Koumei,

    1) PWR050

    Yes, we have had some problems with the PWR050's reliability as an auxiliary power supply. The PWR050 should work regardless if the UCD control card (UCD3138CC64EVM-030) is connected or not. Try disconnecting the UCD3138CC64EVM-030 control card and make sure that the PWR050 is outputting the correct voltages based on the input (Ex. PIN6 of the PWR050 should be proportional to the input voltage). Adding some resistive load on the PWR050 outputs may also help the performance.

    I have attached the schematic, PCB and BoM of the PWR050 to help with your debug.

    7848.PWR050A_SCH.pdf  PWR050A_PCB.pdf  PWR050A_BOM.pdf

    2) Control Card Power

    Are you supplying power on the control card to the UCD3138 via the USB-TO-GPIO2 adapter? You must populate the J2 jumper to supply a 3.3VD power from the USB-TO-GPIO2 adapter to the UCD3138.

    Regards,

    Jonathan Wong