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Design of SMPS - Not sure what these spikes are being caused by.

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T3sl4co1l:
Put roughly half that capacitance across the secondary.  Or maybe more, it depends on the winding and it's not obvious from the datasheet.

Tim

Zog:
Thanks Tim,
I just wacked the extra inductance in series with the primary too. I like easy.
Still lost on wattage though.

T3sl4co1l:
I missed what wattage you're looking for?

Tim

Zog:
I am looking at wattage through the inductors. Peak to peak through L1 (in blue) is about 96W but average is about 17W.
96W is kinda errr.. hot. The fet looks like it's in spec though. Roughly.


T3sl4co1l:
That's instantaneous power and I think mostly reactive at that.  You need average power, with the DCR and core loss entered correctly.

Tim

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