>I chose a switching frequency of 100 kHz for a good balance between being
>easy to filter out of the audio and good efficiency. I came up with a coil
>value of 100mH, which is rather large. In fact, I couldn't find any 100mH
>coils that didn't have a self-resonant frequency that was less than 100kHz!
>
>Any ideas, or is this a lost cause? Is it possible to build a resonant
>converter that can work with nonideal coils with good efficiency? It sounds
>like things could get very complicated very quickly.

I suspect at these very low currents you need a very high switching
frequency. The limiting factor will become the dI/dt function that the
inductor controls, which is why you need such a large inductor.

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