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TPS53355: Vtrip Setting Range Consult

Stanley Dai
Expert 5810 points
Part Number: TPS53355
Other Parts Discussed in Thread: TPS53319

Hi Team,

Is that okay for customer to set the Vtrip as 0.301V? I notice D/S recommends the range 0.4 ~ 2.4V here. If not, what's the reason behind this recommendation? Thanks.

Best,

Stanley

  • 0
    TI__Expert 5310 points

    Hi Stanley,

    I do not see any reason why setting VTRIP lower than 0.4V would present a major issue, but that minimum spec is likely due to the low current limit that a voltage below 0.4V on the trip pin would set for a 30A part such as the TPS53355. I ran a quick calculation, and saw that a VTRIP voltage of 0.3V would set an OCP limit around 5A typically. It is likely the part was not tested below this range. I would recommend evaluating this on an EVM before finalizing the component selection to ensure that the customer sets their OCP limit appropriately.

    Regards,

    Alec Biesterfeld

  • 0 in reply to Alec Biesterfeld
    TI__Expert 5810 points

    Hi Alec,

    Thanks for your answers. In this case, customer use our TPS53355 to replace TPS53319 so the OCP limit is quite low. In summary, customer can set VTRIP lower than 0.4V but should fully test the performance, right?

    Best,

    Stanley

  • +1 in reply to Stanley Dai
    TI__Expert 5310 points

    Hi Stanley,

    Yes, that's correct. I don't foresee any issues, but I recommend testing the performance to verify the OCP limit set with a 0.301V VTRIP voltage is acceptable for the customer given it is quite low relative to the typical current range the device is used for.

    Regards,

    Alec Biesterfeld