[Milsurplus] DC-DC Buck/Boost Converter Regulation

[Peter Gottlieb]

Should be a slam-dunk for one of those things.  The only thing I would watch out 
for is RF getting into the thing which could cause the output to go 
unregulated.  Bypass well and if possible put the thing into a shielded box.  
Additional advantage of doing that is you can more easily (via chokes, caps) 
keep any EMI from the thing making noise you might pick up on a receiver.

Peter



On 10/31/2013 1:06 PM, David Stinson wrote:
>
> ----- 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.
>
>
>