On Tue, 4 Sep 2001, Russell McMahon wrote:

> If you don't mind the extra cost you might consider trying a second of your
> mini-inductors in the output in place of R1. You would want to choose one
> with lower or no more resistance than the present R1. This then gives both a
> smoother output due to the inductance, and the ripple on C1 is also  further
> buffered by the inductance from being reduced by output load.
>
> It would be nice if C1 could be reduced to a 100 NF monolithic ceramic as
> these are common and rather cheaper than the present 680 NF.

  I often use a combination at the output of the switching regulator with
100nF, a toroidal inductance with two coils on both active and gnd line
and another 100nF to output. This usual decrease the output ripple below
10 mV on supplies which have more than 100mV ripple ( and more than 3A on
loads )
Vasile

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