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UCD3138PSFBEVM-027: Power board was not working above 50% load.

Soundharya E
Prodigy 120 points
Part Number: UCD3138PSFBEVM-027
Other Parts Discussed in Thread: UCD3138CC64EVM-030, , UCD3138ALLCEVM150, UCD3138PFCEVM-026

Hi Team,

I am facing some issues while testing UCD3138PSFBEVM-027 using UCD3138CC64EVM-030 daughter card. Board is working properly and provide 12V output at Input voltage of 370V to 385V of 50% load if we go beyond 50% load over current protection is tripping and output voltage goes to zero.

Below are images I attached for reference.

... 

Kindly tell me the solution to solve these issues and why it was happened.

  • 0
    TI__Expert 6200 points

    Hello Soundharya,

    Have you modified the existing UCD PFC firmware in any way? Also, can you show what Fusion Studio looks like when you are below 50% load? What electronic load are you using? While the GUI shows a current of 2A, there may be instantaneous spikes that are causing shorts somewhere on your board, which triggers a fault.

    Do you have other UCD PSFB EVMs or other UCD EVMs, such as the UCD3138PFCEVM-026 or UCD3138ALLCEVM150? Have you tried with other UCD control cards?

    Regards,

    Jonathan Wong