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PSS + PSTB for Buck converter

TH202510293247

Hi,

I am new to power converters. I am currently working on a controller design for buck. I wanted to simulate the stability response for the circuit. While pss is working as per expectation, pstb is giving '0' (-6.4kdB) loop gain and phase. I am using voltage source as probe at the o/p to break the circuit. Can anyone help me - what i am missing here? 

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  • Frank Wiedmann

    If you don't show us your schematic, this will be very difficult. You have to put the probe at a node of the loop that is not being switched, because pstb examines sideband 0.

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  • Frank Wiedmann

    If you don't show us your schematic, this will be very difficult. You have to put the probe at a node of the loop that is not being switched, because pstb examines sideband 0.

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  • TH202510293247
    in reply to Frank Wiedmann

    Sorry about not providing the details....

    Please see below:

    PSS and PSTB settings:

    PSS results:

    PSTB results:

    When I res-simulated the loop gain magnitude is not exactly zero but very low!!

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