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I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step.

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How do we justify this approach, since the basic assumption of small signal modelling is the disturbance is small wrt DC values? enter image description here

During the load step,$\Delta$ Iout would typically be large.

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  • \$\begingroup\$ All these equations are linear or small-signal equations. They assume the converter's model remains linear in this mode - no op-amp saturation, slew-rate issues and so on - and the input or output steps are small enough in amplitude. As long as you see expression in the \$s\$-domain or people use Thévenin, Norton etc. it implies a linear circuit. Keep in mind that most expressions describing the behavior of a switching converters are approximate expressions which only hold within narrow conditions, a small variation around the bias point being one them. \$\endgroup\$
    – Verbal Kint
    Commented Feb 23 at 6:47

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