Also at the meeting, 802.11af Power Over Ethernet (PoE) was mentioned.
I've just started designing some PoE stuff and haven't yet got
prototypes built. For the PD side (the device that consumes power from
Ethernet), it looks like the Linear Technology LTC4267 offers the most
integrated solution, as it provides both the 802.11af control and a
flyback DC-DC controller. It's possible that a less integrated
solution from another vendor might be less expensive, though.
http://www.linear.com/product/LTC4267
LT offers for different LTC4267 demo boards for $75 each, which seems
fairly reasonable:
http://www.linear.com/product/LTC4267#demoboards
I'm designing a PoE PD daughterboard using the LTC4267. I'm only
planning to use class 1 (under 4W) with isolated 3.3V 1A output,
similar to the LT DC804B-A board.
I actually need a class 1 PSE (power source) side as well, so I'm
designing a daughterboard for that using the LTC4263.
http://www.linear.com/product/LTC4263
The system I plan to use that in has a +5V supply, and I can't find
any 5V-to-48V isolated DC-DC converters (or suitable designs), so I'm
using a pair of 5V-to-24V 2W converters.
Eric
