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# Swith-Mode Power Supplies SPICE models

This site offers a download area of Christophe BASSO’s SMPS Spice models.
Chapter 1: this chapter starts with the basics of dc-dc conversion, starting step by step with linear regulators, to derive essential formulas such as closed-loop impedances or closed-loop input rejection. Then the classical buck, boost, buck-boost are analyzed in CCM/DCM and critical modes until an input filter is needed. There, discover the effects of the filter addition and learn how to compensate the converter while still attenuating the input noise (95 pages).

Chapter 2: small-signal modeling is really an important topic if you want to be serious about power supply designs. The chapter starts by showing what State Space Averaging is all about and how complicated it can come. The, the PWM switch model is introduced and three new versions are derived: auto-toggling DCM/CCM voltage-mode and current-mode models, with sub harmonic prediction in CCM for the later. Of course, these models are large signal ones and operate in dc, ac and transient analysis. Finally, a borderline model is derived, later used in PFC stages. This 100-page chapter really explains how these models were derived and how to use them for your studies (146 pages).

Chapter 3: loop control is always hard to understand for some new comers. I’ve strived to make things look simple, explaining how the k factor was derived and showing that, sometimes, it cannot be a panacea to use it. I propose different equations to let you manually select the poles and zeros, right crossing over at the desired point. Also, in most of the books, only op amps are used to illustrate compensation. In this book, I derived transfer functions of TL431 for type 2 and 3 compensators and I show how the optocoupler pole can affect the phase margin (100 pages).

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