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UCC28061: Switching timing when restart

ACGUY
Guru 11170 points
Part Number: UCC28061

Hello E2E,

Please let me know about UCC28061.
When restart after OV-stop that 1-st switching pulses of GDA and GDB are don't match.
At one time, they are turned on at the same time, they are turnd on alternately at the some times, and one side continue to turn on for a while.

Which is the correct behavior?
What is the reason for the different behavior?

Best regards,
ACGUY

  • 0
    TI__Guru 74695 points

    Hello,

    The UCC28061 uses a phase lock loop to interleave the phases.  As startup and over current the phases are in phase and over a few switching cycle will drift out of phase until they are 180 degrees out of phase.

    This behavior is normal.

    Regards,