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TPS6302x BUCK-BOOST Vin short circuit

fabio gaslini
Prodigy 30 points

Hi,

We have a problem with the step-up / step-down (BUCK-BOOST) regulator TPS63021.

In particolar condiction that we can't reproduct, the TPS63021 Vin pin goes in short circuit.

The chip becomes unusable and must be replaced.

Someone can explaine why and show me a solution?

Thanks in advance

Best regards

  • 0
    TI__Guru**** 150950 points

    Most causes of IC failure are board layout related.  I recommend ordering the EVM and testing with its known good layout.

  • 0 in reply to Chris Glaser
    Prodigy 30 points

    Dear Chris and thanks for your answer.

    Unfortunately this particular condition is not so easy to simulate and I think that the EVM can not help me to understand it. Moreover the PCB has been designed on the datasheet specification so I think that it is really okey.

    It is also a problem that I had found on another step up switching controller (no TI) and so I'm starting to think that it is enough common on boost converter.

    Thanks to Your personally and of TI experience on step up (boost) converter what do you think can be done to solve the problem? a snubber could help?

    Could you kindly discuss with Your collegues / technicians in order to understand if it is a problem which has been met, a common problem in boost converter and due to one particular condition. (due to overcurrent or sovravoltage?what is the internal component that goes in short circuit? the mosfet or other?)

    Thanks in advance

    Fabio

  • 0 in reply to fabio gaslini
    TI__Guru**** 150950 points

    Yes, failures with any switching converters are common.  Most of them are due to poor board layout that creates parasitics on the board that overstress the voltage ratings of the device.  If your testing on the EVM proceeds with no failures, then you can be confident that it is board layout that is causing you issues now.  It is a simple way to see if your layout is good.

    Your local TI or distributor FAE can help debug your circuit in detail with you.

  • 0 in reply to Chris Glaser
    Prodigy 30 points

    Thanks Chris.

    Have a nice day.

    FG