Thanks everyone!<div>It's the booster that I was thinking of, i'm looking forward to trying it. It's a big hurdle in wearable electronics. </div><div>M<br><br><div class="gmail_quote">On Thu, Jan 6, 2011 at 5:11 AM, Christoph Maier <span dir="ltr"><<a href="mailto:cm.hardware.software.elsewhere@gmail.com">cm.hardware.software.elsewhere@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On Wed, 2011-01-05 at 21:30 -0800, T wrote:<br>
> > Now, what's all this SEPIC stuff, anyways?<br>
><br>
> SEPIC is a particular type DC-DC converter such as buck, boost,<br>
> buck-boost, can cuk<br>
><br>
> <a href="http://en.wikipedia.org/wiki/SEPIC" target="_blank">http://en.wikipedia.org/wiki/SEPIC</a><br>
<br>
</div>SEPIC is what Dr. Foote calls a boost converter<br>
<a href="http://en.wikipedia.org/wiki/Boost_converter" target="_blank">http://en.wikipedia.org/wiki/Boost_converter</a><br>
in last November's Five Minutes of Fame,<br>
<a href="http://www.ustream.tv/recorded/10946425" target="_blank">http://www.ustream.tv/recorded/10946425</a> ,<br>
beginning at about 49 1/2 minutes.<br>
(Can anyone, by any chance, post the slides somewhere,<br>
Nudge nudge. Nudge nudge. Know what I mean?)<br>
<br>
Unlike the two-component solution<br>
[ <a href="http://www.diodes.com/datasheets/ZXSC380.pdf" target="_blank">http://www.diodes.com/datasheets/ZXSC380.pdf</a><br>
page 1, "Typical application circuit",<br>
and page 6, "Application Notes", Fig. 2],<br>
with a current regulation and efficiency that is so-so<br>
[see the graphs on page 3],<br>
<br>
Jonathan draws some serious power,<br>
so he needs a little more than 2 components,<br>
probably even more than the 5 components in Fig. 5,<br>
to control current and efficiency more accurately<br>
than the ZXSC380, which is more optimized for blinkenlights<br>
(well, ok, 200kHz blinkenlights,<br>
so it looks continuous to the human eye)<br>
running off a single 1.5V-ish battery.<br>
<br>
An LT3092 is the [Norton] equivalent of a waffle iron,<br>
as presented in<br>
<a href="http://www.ustream.tv/recorded/10946425" target="_blank">http://www.ustream.tv/recorded/10946425</a> , 51:40 minutes.<br>
<br>
[ <a href="http://en.wikipedia.org/wiki/Emperor_Norton" target="_blank">http://en.wikipedia.org/wiki/Emperor_Norton</a> ,<br>
<a href="http://en.wikipedia.org/wiki/Norton_equivalent" target="_blank">http://en.wikipedia.org/wiki/Norton_equivalent</a> ]<br>
<br>
<br>
HTH<br>
Christoph<br>
<font color="#888888">--<br>
Linear current sources are easy,<br>
[ <a href="http://reference.kfupm.edu.sa/content/c/m/cmos_current_reference_without_resistanc_122569.pdf" target="_blank">http://reference.kfupm.edu.sa/content/c/m/cmos_current_reference_without_resistanc_122569.pdf</a> ,<br>
<a href="http://www.eelab.usyd.edu.au/andre/publications/BiasgenAICSP.pdf" target="_blank">http://www.eelab.usyd.edu.au/andre/publications/BiasgenAICSP.pdf</a> ]<br>
<br>
getting sufficient control over the necessary means of production,<br>
however ephemeral, is anything but.<br>
</font><div><div></div><div class="h5"><br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br><span style="font-family:'Trebuchet MS', Verdana, sans-serif;color:rgb(51, 51, 51);line-height:22px"><p style="color:rgb(51, 51, 51);font-family:'Trebuchet MS', Verdana, sans-serif;font-size:small;font-weight:normal;line-height:19px;text-align:left;margin-bottom:10px">
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___________</p><p style="color:rgb(51, 51, 51);font-family:'Trebuchet MS', Verdana, sans-serif;font-size:small;font-weight:normal;line-height:19px;text-align:left;margin-bottom:10px">A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.</p>
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