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TPS53353: current limit

GARETH OU
Guru 11415 points
Part Number: TPS53353
Other Parts Discussed in Thread: TPS53319, TPS53318, TPS53355

Hi

The following TPS53353 current limit formula, why is there a difference between 12.1A and 16A?

TPS53318_TPS53319_TPS53353_TPS53355_Calculator_Checklist_2021Jan19.xlsx

  • +1
    TI__Expert 5310 points

    Hello,

    The main difference in the above calculations is that the excel document uses a thermally compensated RDS(on) value of 1.6mohm in its calculation of the current limit. I would use the excel tool as the more authoritative source in your design.

    Please see the attached segment in section 8.2.1.1 for a design example where the thermally compensated RDS(on) value is employed:

    Regards,

    Alec Biesterfeld