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TPS40195 calculation of RILIM

Andreas Kirchgraber
Intellectual 370 points

Hi,

how is RILIM in SwitcherPro calculated ?

If I change the MOSFETs the RILIM changes from 365 to 22.6k. The RDSon of the new MOSFETs are slighty higher(2mOhm to 7mOhm) but the resistor value changes about factor 60. If I try to verify the RILIM value according to the datasheet I never got the values SwitcherPro gets.

 

Andreas

  • 0
    TI__Intellectual 2710 points

    Hi Andreas,

    The value of RILIM is calculated the same way as datasheet formula:

    RILIM(min) = RDSON(max) * ISCP(min) - VILIMMOSFET(min) / ILIM(min)

    The issue in SwitcherPro is that the min value of VILIMMOSFET is (-20). (As per DS page 4) But in SwitcherPro, it is positive 20.

    We will correct this ASAP.

    Thank you for reporting this and helping us improve the quality of our software.

     

    Thanks,

    Hetal Joshi

    Senior Developer and Project Manager

    Analog eLab Design Center

    HPA Design Tools

    Texas Instruments, Inc.