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How to design a Common mode differential mode line filter for DC-DC power supply?
*.How to calculate common mode differential mode inductor and X Y capacitor values.
I want to design a common-mode filter. I've done a lot of research on the internet but couldn't find a formula for it. I have the common choke material that I should use in my circuit, but I don't ...
electronics.stackexchange.com
You cannot calculate exactly which common mode filter will attenuate the common mode to what degree.
I am afraid you must just go on experience, and from looking at app notes , and other people supplies.
Nobody has ever come up with a calculation that can plot what the emc scan will look like, for a given smps, with a given filter/layout/earthing practice etc.
It simply, cannot be calculated...there are too many strays and parasitics at work.
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