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TPS548D22: Short Circuit Protection

Allan Fan
Expert 6300 points
Part Number: TPS548D22

Hi expert,

Do you have TPS548D22 short circuit test waveform can share as a reference? 

What customer measured seems like OCP behavior. We expect Vo shall drop to 0 right away. Although they used E-load but they use multiple and thick wires in parallel. 

Could you please have a look the waveform and comment if it's expected? Or advise proper way to test short circuit? 

Thanks,

Allan

  • +1
    TI__Guru 52195 points

     

    The TPS548D22 does not have "short circuit protection" outside of it's Over Current Protection.

    When the output is heavily loaded, the inductor current out of the SW pin is limited by Over Current Protection to prevent excessive current.  The voltage seen during the load pulse is Vo = Rload x Iocp

    The TPS548D22 will continue generating the OCP current until the under voltage protection (UVP) terminates switching after the UVP delay of 1ms.