I'm trying to find a suitable PoE MagJack for use with my Phy, KSZ8051MNL. The problem is that I can't find one with the same suggested magnetics topology. The closest one I can find has one extra inductor.
Suggested magnetics on the left. Available magnetics on the right.
The available jacks with integrated PoE magnetics don't have the centre tap on the network side of the transformer. Instead they have the centre tap on an extra coil which is obviously for the common mode power. However, I really don't need that as I am going to use the two spare pairs for power.
Is this extra coil likely to be a problem?
Additional information: I do not intend to implement IEEE 802.3af standard, as this application is not intended to be compatible with any other PoE device. It will be running over cables no longer than 2m.
Added: Here's a few of the Jacks with integrated PoE magnetics I can find:
These are just a representative sample. I can find quite a few, but all of them seem to have some difference to the suggested ones.
Best Answer
TLA-6T127LF(-T) supports POE in stock.
http://www.digikey.ca/product-detail/en/TLA-6T127LF-T/445-6788-1-ND/2523609
But the extra coil can be terminated to ground. But no problem if open as it is common mode without much different load.