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45DC-DC Converter Design and Magnetics

than 0.4, we will certainly need a very lar

ge inductor . On the other hand, if we increase

r , there isn ’ t much greater reduction in the size of the inductor. In fact, we will see that

beyond r  0.4, we enter a region of diminishing returns.

In Figure 3.6 , we have also plotted the capacitor RMS currents for a buck converter.

We see that if r is increased beyond 0.4, the currents will increase signifi cantly. This will

lead to increased heat generation inside the capacitors (and other related components

too). Eventually, we may be forced to pick a capacitor with a lower ESR and/or ...