If you have control of both ends, and are not too concerned with=20
interoperability and isolation, then just use the spare pairs to provide=20
to power.

....Andy
On 26/04/2012 04:34, Harold Hallikainen wrote:
> I've got a product with a PIC32 in it that I'm currently driving with a
> 250mA 5V USB style power supply. I'm using a simple linear regulator to
> drop it to 3.3V for the digital, while keeping the 5V for the analog.
>
> Customers don't want to run two wires (Ethernet and USB Power). So,
> there's always Power Over Ethernet. But, it looks complicated and
> expensive, especially for the 2 watts or so we need (a lot more than we'r=
e
> currently spending for the USB power supply, cable, connectors, and linea=
r
> regulator).
>
> But, it seems like this should be a common problem with a low cost modula=
r
> solution. Linear and TI and others are making switching DC to DC converte=
r
> modules, some of which are pretty inexpensive. It SEEMS like there should
> be such a module for POE. It'd have the two diode bridges, load switch, D=
C
> to DC converter, and a DC output. But, I can't find anything like that
> (well, I did find one for $35). Most of the POE stuff is emphasizing high
> power (and cost).
>
> Does anyone know of a low cost POE PD module?
>
> THANKS!
>
> Harold
>
>
>

--=20
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