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I use Simetrix Simplis, which is free. It's a simulator that has proven to be very accurate when I actually test stuff, so I've come to trust the results. I think it's basically a spice simulator, but I don't know anything about spice. I just use this. To simplify things, I just add an ideal switch, ideal diode, and then a capacitance with a given amount if series resistance, and then look at what sort of inductance corresponds to ripple at various switching frequencies. it's really easy to use.
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