related. However, the “ desirable ” value of inductance depends on the specifi c
application
conditions, the switching frequency, and even the topology. So it is just not possible to
give a general design rule for picking L . But there is in fact such a general design rule-
of-thumb for selecting r, one that applies almost universally. We mentioned that it should
be around 0.3 to 0.5 in all cases. And that is why it makes sense to calculate L by fi rst
setting the value of r . Of course, once we pick r , L gets automatically determined, but
only for a given set of application conditions and switching frequency ...
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