Chapter 2
DC–DC Converter Design and Magnetics
This chapter deals with magnetics of DC–DC converters and explains the basic concepts behind peak, AC and DC values of the inductor current waveform. Duty cycle and DC transfer functions are explained. It also introduces the simplifying concept of current ripple ratio. The differences in behavior of the inductor current waveform with respect to input voltage variations and topology are highlighted. Optimum inductor design targets for each topology are thus provided. The worst-case input voltage is identified for correctly picking an inductor in wide-input DC–DC converters. Related topics such as current limit accuracy and also subharmonic instability when using current-mode control are introduced ...
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