Julf wrote: 
> Lower internal resistance, higher peak current capability, much better
> suppression of HF noise, better regulation, higher efficiency, smaller
> size, lower weight.

Whilst I would agree with you that a SMPSU for a SB is as good as is
needed, of the 7 things you say that the SMPSU is better only 3 are
correct.

A linear regulator will in general have better (Lower) internal
impeadence due to the fact that the feedback bandwidth of linear
regulators is generally higher that in a SM. SMPSU are limited in (real)
bandwidth to the swiching frequency. A linear can be many MHz

Higher peak current is neither type, it depend on the current limiting
system.

Switch noise is dominant noise in a SMPSU and is oreders of magnitute
worse than a fairly bog standard linear.

Regulation is down to feedback bandwidth, linears win hands down.

higher efficiency, smaller size, lower weight SMPSU wins most of the
time.

The best solution would be a SMPSU followed by a Linear, giving the low
noise etc of a linear with most of the advantages of a SMPSU.


However theres still the regulator in the SB/Pi, In the Pi its a SM not
sure about the SB's


Jeff



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