On 01/14/2014 10:11 AM, David wrote:
less expensive than using a lossy ferrite bead as a filter.
As a practical matter, adding a printed circuit board decoupling filter can mean
the difference between 50mV peak to peak of switching noise and 5mV peak to peak
of switching noise.
Suppose you have a shield on your switcher output made of ground plane
in one of your board layers. I'd stop that ground plane half way between
the first cap in the C-R-C filter and the end one so the noise on the
ground plane doesn't couple well to the second cap.
I like using layout tricks to avoid a component to assemble.
