Chapter 4

The Topology FAQ

This chapter presents quick FAQs (frequently asked questions) to clarify and solidify all the concepts presented so far. It not only covers the key topologies but also includes new topics like low-side current sensing and maximum duty cycle considerations. It also provides quick lookup tables for calculating the average current flowing at different points in the three basic topologies. It is recommended to read this chapter before moving on to the more advanced chapters that follow.

This section serves to highlight and summarize the gamut of key topology-related design issues that should be kept in mind when actually designing converters (or when appearing for a job interview!).

Questions and Answers

Question 1: For ...

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