A quick recap on transfer functions before we get going might be beneficial. A control system is used to define electromechanical behavior.

Transfer functions analyze how system output changes depending on the input. This article details how to implement a transfer function in LTspice, comparing ideal vs. modeled ...

Transfer functions of interest for switching dc-dc converters are input impedance, output impedance, duty cycle (or control voltage) to output voltage, and input voltage to output voltage.

This course teaches how to design a feedback system to control a switching converter. The equivalent circuit models derived in the previous courses are extended to model small-signal ac variations.