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UCC28070 safe startup

evs
Genius 5910 points
Other Parts Discussed in Thread: UCC28070

I'm trying to safe startup my 1500W interleaved PFC. But I have problems. I got 75ns pulses at 200khz at pin GDA. My gate driver doesn't like that. So any suggestion how to safe startup the controller.  Is there a way to break the loop for safe startup.

Thanks!

  • 0
    TI__Mastermind 34465 points
    I think that rather than trying to open the feedback loop, you should try to find out why the GDA pulses are only 75nS wide.
    Do you have a circuit schematic and design specification ?

    Regards,
    John Griffin
  • 0 in reply to John Griffin1
    Genius 5910 points
    I see that er are a lot of questions/problems with the UCC28070. (maybe double check the calc sheet. I doubt the results, specially the currents).

    I'm wondering? How do you first startup a PFC?(or any power electronics) Plug in the the AC mains and see what happens?
    Please share with us.