Ringing choke conver without Y-Cap.?

Sep 30, 2005 1 Replies

Hi, all,



Ringing choke converter is applied in adapter or charger under 10W with Y-Cap.



Now, I have to remove Y-Cap. from it that can be made in low cost with



8dB EMI margin like with Y-Cap.

Can I make it? How can I make it?



Thanks,


From Bob.

If you look carefully in Power Integration's application notes they even give an example of a low power smps without an X cap.

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The X and Y caps do not have any 'function' with respect to the operation of an smps. They are simply there for EMI.

There's no way ( I know ) you can design for that margin without testing though.

Graham

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