DC Converter Design and Magnetics

The reader is strongly advised to read Chapter 1 before attempting this chapter. 

Toward the end of this chapter, we will hnally present the detailed dc-dc converter design procedure. But to account for a wide-input range, we will proceed in two distinct steps  

Note that, although the design procedure may be seen to specifically address only the buck topology, the accompanying annotations clearly indicate how a particular step or equation may need to change if the procedure were being carried out for a boost or a buck-boost topology. 

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This should serve as an introduction to understanding and designing switching power converters. More details and worked examples can be found in the next chapter (titled DC-DC Converter Design and Magnetics ). The reader can also at this point briefly scan Chapter 4 for some finer nuances of design. A full design table is also available in Appendix 2 for future reference. 

Because of the similarities between dc-dc converters and off-line converters, most of the spadework for this chapter is in fact contained in the preceding chapter ( DC-DC Converter Design and Magnetics ). The basic magnetic definitions have also been presented therein. Therefore, the reader should read that chapter before attempting this one. 

What happens to the B-field Don t we have to consider the possibility of saturation here Well, B is proportional to LI/N (see Chapter 2, DC-DC Converter Design and Magnetics ). So if inductance quadruples, I halves, and N doubles, the B-field is unchanged ... 

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