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TPS54231 OCP setting

Jim CHEN
Expert 4795 points
Other Parts Discussed in Thread: TPS54231

Dear All,

Do you know how to calculation OCP setting point for TPS54231, cusomter use 19VIN, 12Vout, L=4.7uH, f_sw fixed at 570K,  output caps use 10uF*2 pcs. Thanks 

Regards,

Joseph Chen

  • 0
    TI__Guru**** 191445 points

    The over-current threshold is fixed at 2.3 A minimum and 3.5 A typical.  That is peak switch current.  If you are trying to calculate the dc load current, it is I OCP - 1/2 Ilpp.

    Ilpp can be calculated from equation 9 in the data sheet.

  • 0
    TI__Expert 4795 points

    John,

     

    Thanks, I still have question about TPS54231 over current protection, can you please give me more explaination?

    if TPS54231 over current moment, switching is limited, if we short output to GND whether output voltage will be not latch off mode, only output voltage drop? TPS54231 will normal output switching until output load and short removed?

    If tyes, how to do we can let TPS54231 latch off when over current/ short current event? Thanks

     

    Regards,

    Joseph Chen

  • 0 in reply to Jim CHEN
    TI__Guru**** 191445 points

    OCP is non-latching.  The peak current is limited on each pulse.  The output voltage will fold back as the short circuit resistance times limited output current is less than teh regulated voltage.  If you need latching OCP or hiccup mode you would have to design an external current sense and latch to control the EN pin of the device.