POE circuit with small transformer and small volume footprint

Question

I would like to make an isolated POE802.3af controller that can convert POE ~48V to 5V 2A, but the main problem is most designs use a standard POE transformer that has multiple coils. The problem with multiple coils is they are bulky and take up lots of volume.

For example the TPS27331 Source: TPS23731 Datasheet

If designing an IoT device this makes the design difficult if it's volume constrained. One way around this is to drop isolation and use a low end buck, but this presents a few challenges as it makes the device more susceptible to ESD, it also nullifies any way to get an 802.3 certification as Ethernet/POE needs to be isolated for this standard. Is there a way to use a small transformer in an isolated flyback POE design?

Answer 1

Yes, the MP8107 uses a flyback topology that is isolated and can use a smaller 2 coil transformer. The overall footprint is ~1"x0.7"

Source: https://www.monolithicpower.com/en/mp8017.html#gallery-1