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about synchronous buck's bode plot

user3588080
Intellectual 420 points
Other Parts Discussed in Thread: SFRA

I calculated synchronous buck transfer function Bode plot drawn as follows , with reference to "switching converter dynamic performance", and the use of SFRA ti Potter result is as follows: I ask why is there such a big difference  ? SFRA results Why have a 360 ° phase mutation it

  • 0
    Expert 1605 points
    Please note something: the transfer function you calculate for your converter is usually based on small signal analysis... the theory in use is matching with reality only up to half the switching frequency of the converter. So if your frequency responses match up to half the switching frequency, I would say that everything is working fine. It is normal that the measurements are very different from the theory when you approach the converter switching frequency.

    Regards

    Leo