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What is the switching transfer function?
2022.04.22
In this chapter, we will first derive the switching transfer function for the buck mode as a base, and then use the state averaging method to derive a unified transfer function that is not specific to any operating mode, keeping in mind the equations we have derived so far. For this reason, the flow of this chapter is summarized in Figure 1.
Many people may not understand what the state averaging method is when they hear it. However, if you can use it, the transfer function of each converter can be derived by a unified approach.
In this section, we will explain the following.
【Download Documents】 How to Derive Transfer Functions: Basic Equations Quick Reference
This handbook explains how to derive transfer functions, starting with basic equations and an RC low-pass circuit. It covers gain and phase, functional block decomposition of DC-DC converters, voltage- and current-mode control, and derivation procedures using state-space averaging. It also summarizes subharmonic oscillation and slope compensation, with links to TechWeb articles for detailed derivations.
