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Reference design of CRD-30DD12N-K: open loop test function

gkim
gkim Contributor Level 3
edited January 2023 in General

Hello,

With respect to the reference design of CRD-30DD12N-K, I have a question on the firmware feature.

It seems that the firmware provides the open loop test function for this LLC topology.

What should be measured or examined during the open loop test function?

Thank you for your consideration.

With regards,

GKIM

Comments

  • FrankWei
    FrankWei Wolfspeed Employee - Contributor Level 2

    Hi GKIM,

    sorry for my late response. with open loop, you can measure the waveforms such as PWM signals.

    Regards,

    Frank

  • gkim
    gkim Contributor Level 3

    Hi FrankWei,

    Thank you for your review.

    It seems that, when the open loop test function is activated, the PWM frequency for all three legs changes from 135kHz up to 180kHz without any DC-DC converting function.

    Is this correct?

    Thank you for your consideration.

    With regards,

    GKIM

  • FrankWei
    FrankWei Wolfspeed Employee - Contributor Level 2

    Hi GKIM,

    Yes, the PWM frequency range is from 135kHz to 250kHz.

    Regards,

    Frank

This discussion has been closed.