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TPSM8A28: Webench efficiency gap from the datasheet

Kazuki Itoh
Genius 9175 points
Part Number: TPSM8A28

Hi team,

My customer found TPSM8A28 efficiency gap from the datasheet.

He would like to check VIN=12V, VOUT=5V, IOUT=4A, 600kHz FCCM frequency of TPSM8A28.

In the datasheet Figure8-9, it looks like ~93%. But the Webench shows that the efficiency is 95.8%.

Please see the design from the link below.

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=B17AB2F40095B549

Could you please double check?

Regards,

Itoh

  • 0
    TI__Genius 14827 points

    Hi Itoh,

    Our US team will check it and reply you soon.

  • 0 in reply to Miranda Gu
    TI__Mastermind 28720 points

    Hello,

     

    The WEBENCH simulation is just a simulation tool which is based on equations and calculations. Its intend is to provide estimations based on inputs to get the customers started with their designs. For example, in the same model just by adding some thermal factor and board size the Webench I got 94%.

    https://webench.ti.com/power-designer/switching-regulator/customize/101

    The datasheet efficiency curve in the datasheet is the actual results are more accurate. VIN=12V, VOUT=5V, IOUT=4A, 600kHz FCCM, I see about 93.5%

    Additionally, it may be preferable to have the customer evaluate on the EVM to their desired application to get a better understanding of the device's performance.

     

    Thanks

    Tahar

  • 0 in reply to Tahar Allag
    TI__Genius 9175 points

    Hi Tahar-san,

    Thank you for checking. But I can't check your WEBENCH design from the link.

    Could you double check?

    Regards,

    Itoh 

  • +1 in reply to Kazuki Itoh
    TI__Mastermind 28720 points

    Hello Kazuki-san, 

    In the WEBENCH, you can play with some parameters such temp, board size...etc and you can see the effect on the efficiency. 

    The point I am trying to make is that the  WEBENCH simulation is just a simulation tool which is based on equations and calculations. Its intend is to provide estimations based on inputs to get the customers started with their designs. 

    I would go with datasheet efficiencies to have much more accurate numbers.

    If you want to go even further, order an EVM and make the changes on the EVM like BOM (CIN/COUT), VIN, VOUT, Fsw, Ta...etc that matches your application needs to get as close as possible to the number you may see on your board. 

    Thanks!

    Tahar