[oopic] Re: ooPIC-R Optional Voltage Regulator

--- In oopic@yahoogroups.com, "design.wonk" <design.wonk@...> wrote:
>
>
> --- In oopic@yahoogroups.com, "rtstofer" <rstofer@> wrote:
> >
> > --- In oopic@yahoogroups.com, "design.wonk" <design.wonk@> wrote:
> > >
> > > When adding regulated servo power I assume that I would
> > > 1) Add a regulator
> > > 2) Move the PSL jumper form +SP to +SPR
> > > 3) Move jumpers s1 to s4 as needed
> > > 4) Connect a secondary 9V power source to pins 6 and 7 of the
> > > optional power pins.
> > >
> > > sound right?
> > >
> > >
> >
> > Yes
> >
> > As long as you don't want to use the existing voltage regulator
that
> > is intended to driver peripheral and servo loads.
> >
> > But, if you are talking about servo power only, why not plug a 6V
> > battery into +SP and Gnd and call it a day? You certainly don't
need
> > sub 1% regulation for servos.
> >
> > The power design of the R board is quite flexible. Well thought
out...
> >
> > I think Dan's point is to be absolutely certain that the pinout
on the
> > R board for the 3d regulator actually matches a 7805 and not one
of
> > the others. I don't have an R board so I can't check. But for
servo
> > power I wouldn't be adding a regulator anyway.
> >
> > Richard
> >
>
> Richard,
>
> Actually, I am not using it for servos. I want to run 6 Sharp IR
> sensors on a single ooPIC-R (the big GP2Y0A700K0F sensors that draw
> about 350mA each).
>
You are going to have a lot of trouble getting 2.1A out of a 7805 (1A
Max). You may need to look into building an off board regulator for
each one. I don't like to pull more than 0.5A from one regulator.
It also depends on your supply voltage as to how much current you can
get from a regulator. The higher your supply, the more power the
regulator has to dissipate. Pd = (Vs - 5) * Io. If I am going to be
pulling more than 50mA, I will usually put a heat sink on it.

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