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Power loss of MOSFETs formulas derivations

Catalin Muntean
Intellectual 280 points

Hello everybody,

I have been watching the following video from the Power Training Series called "Design review of a 2-kW parallelable power-supply module" : https://training.ti.com/design-review-2-kw-parallelable-power-supply-module?cu=1127730

At 26:03 at the bottom of the presentation, the author is showing formulas in order to calculate the Power Loss of the MOSFET.

My question is: Can you reference me any application note/white paper/ IEEE paper/ Book etc...  which shows the derivation of those formulas ?

Thank you in advance for your time !

Best regards,

Cata

  • 0
    TI__Expert 5435 points

    Hi Catalin,

    There is a white paper associated with the video.  Please refer to that.

    Also you can try power stage designer, it is able to calculate the RMS currents and give you some info that can be used in calculating losses.

    Thanks,

    Robert

  • 0 in reply to Robert Taylor1
    Intellectual 280 points

    Hi Robert,
    I know that there is a white paper associated with the video, but that white paper just shows the equation on how to calculate the power loss.
    What I am asking for is how did they arrive to that expression, what assumptions did they make in order to arrive to the expression to calculate the power losses ?

    Thank you

  • 0 in reply to Catalin Muntean
    Intellectual 280 points

    I have figured it out.

    They approximate the voltage/current waveforms by straight lines with voltage/current constant while the other one is changing, as we know from the switching transition stages of a MOSFET.

    Attached graph for visual representation.

    That gives the switching losses.