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TPS628501-Q1: Clarification about converter behavior during short circuit on output

Florin Dumitrache
Prodigy 155 points
Part Number: TPS628501-Q1
Other Parts Discussed in Thread: TPS628501

Hello,

In the datasheet of TPS628501-Q1 there is the following description regarding the output short circuit protection:

So as I understand, in a short circuit condition, the high-side MOSFET will switch off, and will be turned on again after the current drops below the current limit of the low-side MOSFET, which will always happen as when the HS MOSFET is turned on, there is no power supplied to the short circuit. => therefore the converter will never turn off its output during a short circuit on the output. 

Below a measurement done during the application of a hard-short (less than 50mOhm) directly on the output of the TPS628501. The converter does not turn off. Is this the correct/expected behavior ?

  • +1
    TI__Expert 7585 points

    Hi Florin,

    Thanks for your question.

    The waveforms seem ok to me.

    As described in the datasheet, the device does not turn off, but it only tries to limit the output current value on a cycle by cycle basis, switching off the high side FET whenever we hit the current limit.

    Please ask again if you have further questions.

    Thanks,

    Stefano