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[DPRG] More efficient voltage regulator?

Subject: [DPRG] More efficient voltage regulator?
From: David P. Anderson dpa at io.isem.smu.edu
Date: Wed May 24 19:52:23 CDT 2000


On Wed, 24 May 2000 17:03:19 Michael.McQuay wrote:

>         I'm currently building a Homebrew BS2.  The Homebrew BS2 kit didn't
> come with it's own 5v regulator.  I'm using a 7805 regulator for now, but
> I've heard this style of regulator is not very efficient.  Power being of
> critical interest in robotic applications, I would like come up with the
> most efficient 5v regulator that I can.  What are my options?  Is there a
> custom circuit I can build?  Or a more efficient regulator package than the
> 7805?
> Any ideas?

I've had good success with the Power Trends dc-dc converters.  Here's a
dprglist posting (from March?):

> Someone asked me about the dc-dc converter used to power the processor
> board on the lego robot I brought to last month's DPRG meeting.
> This is a pretty neat part available from Power Trends (recently
> acquired by TI, as I understand) that is a drop-in replacement for 
> a 780x regulator, but is actually a tiny switching power supply.
> These do dc-dc conversion very efficiently, and with no discernible
> heat.  I use one to get regulated 5 volts for robot microprocessor
> electronics from the 12 volt lead-acid battery that powers the motors
> on a couple of my mobile 'bots.  They're a little pricy, about $18 dollars 
> as I remember, but I've gotten several as free samples from their web page,
> www.powertrends.com.  The one I'm using is the PT78S100 series.  This takes
> the 12-14 volt input from a 10 cell nicad pack on the lego robot and
> outputs a well regulated 5volts for the electronics.
> I believe I originally found out about these a few years ago from this
> very discussion list.  


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