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From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: 12V -> 15V ?
Message-ID: <5170117@hplsla.HP.COM>
Date: 7 Mar 91 03:34:16 GMT
References: <13336@ccncsu.ColoState.EDU>
Organization: HP Lake Stevens, WA
Lines: 8

> What are some ideas about raising 12 volts to 15 volts?

Try a switching regulator.  National's new line includes one that does
step-ups.  You can also fairly easily build your own, using more parts.
One difficulty is if the 12 volts gets too close to 15 (as in _above_
15), in the typical step-up switcher you end up with problems because
the input ends up unattenuated at the output...but there are other
topologies that work.