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Original question:

UCC27524A: ucc27524 failures rate

UCC27524A: Doubt on UCC27524

Nidheesh BR
Expert 1295 points
Part Number: UCC27524A
Other Parts Discussed in Thread: UCC27524, UCC27531

I was facing the same issue with UCC27524A. after turn on supply, I tried to turn on PFC. But there was no boot. So while checking for the error it is found that gate driver gate and ground got shorted.

And the same error is repeated 2-3 times. So I replaced UCC27524A with UCC27531D. Then it was working fine.

  • 0
    TI__Genius 13445 points
    Hi Nidheesh,

    Sorry about the trouble, my name is Mamadou, I am the applications engineer supporting this device.

    I have not seen your plots yet but from your description, the driver output stage is likely damaged.
    This failure is likely caused by overshoot at the gate leaking back to the driver's output stage and exceeding the abs max ratings of the driver. Were the FETs damaged as well or just the driver?
    UCC27524 is rated at 20V abs max whereas UCC27531 is at 35V abs max.

    Can you please share details of the working waveforms WITH UCC27531 (under normal operation) and UCC27524(at low voltages) as well as the respective operating conditions.
    Just a sanity check but has there been changes made to the reference design before testing? Is R44 populated?

    Thanks in advance for the clarification.

    Regards,

    -Mamadou
  • 0 in reply to Mamadou Diallo
    Expert 1295 points

    Hi Mamadou,

    thank you for your feedback.

    with UCC27524A, the only gate driver is failing but nothing happened for MOSFET.

    No changes have been made from the reference design. R44 is populated only while using UCC27531.

    UCC27524 was working with some other brand mosfet and it is failing with the infineon mosfet suggested in the design.

    Testing was done with a reduced voltage of 120 V rms and load 100-300W.

    Thanks.

  • 0 in reply to Nidheesh BR
    TI__Genius 13445 points
    Hi Nidheesh,

    Thanks for getting back to me.

    The fact that the driver is failing and that FETs are not leads me to believe that there was overshoot (Vgs > 20V) at the gate of the MOSFETs (rated at +/-30V dynamic Vgs) leaking back to the driver's output stage (rated at 20V abs max).

    If you can, please share waveforms of VDD/VCC, OUT pins, IN pin to understand if VCC exceeded abs max or a case where VOUT exceeded abs max.

    In the meantime, I would recommend using UCC27531 for now while I investigate the issue with the use of UCC27524A.

    Thanks.

    Regards,

    -Mamadou
  • 0 in reply to Mamadou Diallo
    Expert 1295 points

    Hi Mamadou,

    Thank you for your response.

    Now it is working fine with UCC27531. I was having issues with the inductor.

    So after this, I will again go back to UCC27524. At that time if I am getting Failure I will let you know with the waveforms.

    Thanks.

  • 0 in reply to Nidheesh BR
    TI__Genius 13445 points
    Hi Nidheesh,

    Thanks for the updates.

    I will close this thread in the meantime. But please let us know if the issue persists with UCC27524.

    Thanks.

    Regards,

    -Mamadou
  • 0 in reply to Mamadou Diallo
    Expert 1295 points

    Hi Mamadou,

    Ok sure. Thank you for your suggestion and feedback.

    Regards.