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In Reply to: RE: How to connect LL2733 for choke input posted by vbenonisen on November 06, 2016 at 16:38:44
You might still consider using a small value film cap after the rectifiers. There will be a short window in every AC cycle where the rectifiers are not conducting. As the magnetic field in the choke collapses it will generate a high voltage spike. A small cap before the choke will help mitigate that issue.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Follow Ups:
Ok, Thank you. Good to know. Tried to model it with PSU Designer II, but it didn't work out. How small should it be?
Edits: 11/07/16
My guess is you'd be looking at 0.2-1.0uF. It will increase the output voltage somewhat and also increase the output impedance of the PS by a small amount. Be sure to use a cap that is rated for high ripple current. Some of my projects that are designs of Kevin's use a Gentech 1.0uF cap that he favors and the big mono-blocks with a 600V B+ use 850V rated GE 0.68uF caps. Morgan Jones 4th ed. has a graph that illustrates the change in voltage and output impedance with different cap values.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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