[Noisebridge-discuss] driving multiple LEDs with minimal batteries

meredith scheff satiredun at gmail.com
Thu Jan 6 12:17:47 PST 2011


Thanks everyone!
It's the booster that I was thinking of, i'm looking forward to trying it.
It's a big hurdle in wearable electronics.
M

On Thu, Jan 6, 2011 at 5:11 AM, Christoph Maier <
cm.hardware.software.elsewhere at gmail.com> wrote:

> On Wed, 2011-01-05 at 21:30 -0800, T wrote:
> > > Now, what's all this SEPIC stuff, anyways?
> >
> > SEPIC is a particular type DC-DC converter such as buck, boost,
> > buck-boost, can cuk
> >
> > http://en.wikipedia.org/wiki/SEPIC
>
> SEPIC is what Dr. Foote calls a boost converter
> http://en.wikipedia.org/wiki/Boost_converter
> in last November's Five Minutes of Fame,
> http://www.ustream.tv/recorded/10946425 ,
> beginning at about 49 1/2 minutes.
> (Can anyone, by any chance, post the slides somewhere,
> Nudge nudge. Nudge nudge. Know what I mean?)
>
> Unlike the two-component solution
> [ http://www.diodes.com/datasheets/ZXSC380.pdf
> page 1, "Typical application circuit",
> and page 6, "Application Notes", Fig. 2],
> with a current regulation and efficiency that is so-so
> [see the graphs on page 3],
>
> Jonathan draws some serious power,
> so he needs a little more than 2 components,
> probably even more than the 5 components in Fig. 5,
> to control current and efficiency more accurately
> than the ZXSC380, which is more optimized for blinkenlights
> (well, ok, 200kHz blinkenlights,
> so it looks continuous to the human eye)
> running off a single 1.5V-ish battery.
>
> An LT3092 is the [Norton] equivalent of a waffle iron,
> as presented in
> http://www.ustream.tv/recorded/10946425 , 51:40 minutes.
>
> [ http://en.wikipedia.org/wiki/Emperor_Norton ,
>  http://en.wikipedia.org/wiki/Norton_equivalent ]
>
>
> HTH
> Christoph
> --
> Linear current sources are easy,
> [
> http://reference.kfupm.edu.sa/content/c/m/cmos_current_reference_without_resistanc_122569.pdf,
>  http://www.eelab.usyd.edu.au/andre/publications/BiasgenAICSP.pdf ]
>
> getting sufficient control over the necessary means of production,
> however ephemeral, is anything but.
>
>
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>



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