[SI-LIST] Re: Power supply filtering
- From: Bob Patel <whizplayer@xxxxxxxxx>
- To: Andrew.Ingraham@xxxxxx, si_list <si-list@xxxxxxxxxxxxx>
- Date: Fri, 2 Aug 2002 15:46:23 -0700 (PDT)
Thanks for all the responses. I have found ferrites
with higher current capability from steward.com.
Bob
--- "Ingraham, Andrew" <Andrew.Ingraham@xxxxxx> wrote:
> Just an fyi ---
>
> My understanding of ferrite beads is that their
> filtering effectiveness
> is what drops off when you exceed the current
> "limit" ... not the DC
> output voltage.
>
> Most ferromagnetic devices are softly nonlinear, and
> the AC electrical
> characteristics change when the current is too
> great. But the DC
> voltage drop could still be close to zero (esp. if
> it's a bead slipped
> over a low gauge wire).
>
> > ----------
> > Also this ferrite bead has curent limit
> > to 300ma, now if the circuit draws more than 300ma
> ,
> > then the voltage will start dropping at the input
> of
> > the circuit. Hence cannot use ferrite beads.
> >
>
>
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