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TPS55288: SCP bit (Bit7 of 0x07h register) is not asserted after short circuit test

Tiger Yeh
Expert 5095 points
Part Number: TPS55288

Hi,

My customer did perform short circuit tests, but it looks the SCP bit is not asserted.

Only bit6 OCP bit is asserted.

The register 0x05h bit[7:6]= 1:1, suppose SCP bit should be enabled.

Please help to check whether there is any other register to be taken care.

Thanks and Best regards,

Tiger

  • +1
    TI__Mastermind 24280 points

    Hi Tiger,

    Please take care if the loading wire is long because the OCP condition needs to satisfy the average inductor current hitting the set limit and the output voltage below 0.8
    V, then OCP bit can be set.

    Can you show the waveforms of iL and Vout when the customer did the short circuit?

    BRs,

    Bryce

  • 0
    TI__Mastermind 24280 points

    Hi Tiger,

    We have not seen an update from you for three weeks, so I assume the questions are answered and the issue is solved.

    I close this thread now. If there is still something open, please reply and the thread will get opened again.

    If you have any other question or of the thread has been locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,

    Bryce

  • 0 in reply to Bryce Xun
    TI__Expert 5095 points

    Sorry for late to update status, Bryce.

    Because there is eFuse (TPS259474L) between TPS55288 output and load, suppose the SCP is protected by eFuse first.

    This is why TPS55288 is not asserted SCP bit.

    Thanks and Best regards,

    Tiger