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Old 11-19-2017
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ashiekh ashiekh is offline
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One thing I find missing in many power supply reviews is the switching frequency (typically 50 kHz - 1 MHz); the higher the frequency the better the power to weight ratio and the easier things are on the secondary caps. But one will suffer the skin effect at high frequencies, and need Litz wire for the transformers, which I have seen used.

I have no problem with 85C capacitors on the input; some people argue that 105C units have higher ESR and so potentially lower life. It is the output side that has a lot of capacitor failures, but the move to higher frequencies is easing the internal heating they suffer (from ripple current).

Last edited by ashiekh; 11-19-2017 at 10:31 AM.
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