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UCC27511: UCC27511 keeps failing

Martin321
Prodigy 10 points
Part Number: UCC27511

Hello everyone,

currently, we implemented the driver UCC27511 to drive IGBTs with high pulse currents. To avoid parasitic turn-on, the OUTL gate resistor has a very small value - but still high enough not to exceed the maximum current. The OUTL is protected against negative input voltage by means of fast SiC diodes to ground. The voltage on supply and ground pins looks clean.

However, the device keeps failing randomly by permanently shorting the gate and we are unable to explain why. Have you any information concerning another special sensitivity of the device beyond what is mentioned in the datasheet?

Any help in this matter would be greatly appreciated.

Best regards,

Martin

  • 0
    TI__Guru**** 189399 points
    Hi Martin,

    Welcome to e2e, and sorry to hear about the issues you're having.

    This is a very popular device, and we have not gotten reports of issues like you're seeing.

    In order to help you figure out what is going on, we'll need some more information. Can you post a snippet of your circuit showing the UCC27511 and the IGBT, including IGBT p/n? Can you also take some scope shots of the gate signal?

    One thing I would investigate is that the gate voltage isn't being exceeded, either by negative transients (gate to emitter), or high frequency oscillation on the gate of the IGBT.

    Also, if you can share your circuit topology, that might give hints as well.

    And, to confirm, the UCC27511 or IGBT fails?
  • 0 in reply to Don Dapkus
    TI__Guru**** 189399 points
    Hi Martin,

    Since we haven't heard back from you, I conclude you solved this issue, so I am going to mark this thread as TI thinks resolved. If you can, please log-in and press the Green button to confirm your issue is resolved.

    If not, please post more details, and we will work with you to get the issue resolved.