[Milsurplus] DC-DC Buck/Boost Converter Regulation

[David Stinson]

----- Original Message ----- 
From: "Peter Gottlieb" <nerd at verizon.net>

> Boost converters frequently won't allow their outputs to go below their 
> inputs.  You want a true buck-boost if you want to operate a 12 volt load 
> from 8-whatever voltage.  It's not completely clear the first one does 
> that.

My interest is in using them as the regulating element in a primary
filament power supply, bucking 28 volts down to 12 and which
needs to be well-regulated, similarly to what one might do with an LM-317
but at higher currents.  Don't know how well they would handle a "noisy" 
input.
Might need to "smooth" the input better before using such a device to 
regulate.
I'm not sure how much "swing" they can take on the input and still properly
regulate the output voltage.   I've looked at the datasheets and have
likely just missed the datapoint.  Hoping someone here has
looked into it.
73 D.S.