Lpc2000

Oops, too late!

David P Harris wrote:

> Sorry, hadn't been following this discussion-- you might be interested
> in this very inexpensive solution: <http://www.romanblack.com/smps.htm>
>
> David
>
> Guillermo Prandi wrote:
>
> > Sean, the device will be idle most of the time. The target
> > application will be running ~19 days without recharging from a 12A/H
> > 12V lead acid battery. Keep in mind that the battery has a self-
> > discharge ratio that will leave me with ~80% of the charge (9.6 A/H).
> >
> > My ideal power supply should be extremely efficient in the <100 mA
> > range. Due to the duty cycle (>1:60 for four days, >1:600 for 15
> > days), I can stand a *linear supply* performance for currents above
> > 150 mA.
> >
> > I'm currently experimenting with a MAX1684 for the main circuit (<150
> > mA, 100 mA typical when full active) and a linear regulator (LM317)
> > for the radiomodem (<5mA typical 98.3% of the time, 160~200mA average
> > 1.6% of the time). I'm trying to trick the LM317 with large R1-R2
> > values (~8K\ufffd) to keep power consumption low. The radiomodem will work
> > well from 3.3 to 4.5V, so I can bear a considerable deal of voltage
> > shift in the regulation from this side. Though this may seem a
> > nonsense, I'm actually getting better numbers at the end.
> >
> > Guille
>
>
>
>
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