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Efficiency Graph doesn't match power dissipation data under stress tab (TPS40193).

Alek Toomians
Prodigy 660 points
Other Parts Discussed in Thread: TPS40193

When the efficiencty data from the graph is compared to power dissipation numbers that are reported under "Stress" tab, they don't match. The efficiency graph is lower by more than 10%. What's missing from Stress calculation.

Design:

TPS40193, Lout= IHLP-5050CE-01 4.7uH , Cout=2x C3225X5R0J107M , MOSFETS=FDS6898AZ, Vout=1.25V @ 5A, Vin=10.8-13.2

  • 0
    TI__Intellectual 2710 points

    Thank you for reporting this. We will look into this issue and update you.

  • 0 in reply to Hetal
    TI__Prodigy 660 points

    Any updates on this issue?

     

  • 0 in reply to Alek Toomians
    TI__Intellectual 2710 points

    We are working on efficiency issue currently. The changes will be released next month.

  • 0
    TI__Intellectual 2710 points

    Power dissipation under 'Stress' tab is the worst case loss for each component. The efficiency graph displays efficiency for a range of output current. We are not comparing apples to apples when we compare the two. A worst case for cap is not a worst case for an inductor, for example. All worst cases cannot happen at the same output current. So, efficiency and stress numbers are not supposed to match.

    As mentioned in previous post, we are working on improving efficiency modelling which will be released in July.

    Thanks,

    Hetal Joshi

    Senior Developer and Project Manager

    Analog eLab Design Center

    HPA Design Tools

    Texas Instruments, Inc.

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.