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UCC28180: Waveform of startup

David Kim2
Genius 3385 points
Part Number: UCC28180


Hi

There is a section where vgs stops twice at the start.

I think the first one is OVP.

Why does the second stop?

Is there no problem?

Pls refer to below.

Thanks

  • 0
    TI__Genius 11350 points

    Hi David,

    Unfortunately, from the picture you've uploaded, it's very hard to see what's going on as I can't read the voltage or time scales.  It appears that the second time the gate signal is halted, the controller may be responding to that slight bump evident in the output, so perhaps another (potential) OVP event.  It's possible that the voltage compensation is slightly underdamped resulting in "overreaction" of the output. However, I can't say for sure without more information.

    Can you capture and upload a new waveform that includes the COMP signal as well as setting the VIN channel to AC-coupled with a 5V/div range so I can clearly see the output voltage and time scale?  A zoom-in at the two areas where switching starts/stops would be helpful.

    Also, it would be helpful if you share your compensation values.

    I look forward to seeing this new information and helping you with this issue.

    Regards,

    Ray