The B82806D pulse transformers from EPCOS are available from Mouser Electronics. The transformers are designed specifically for the IEEE 802.3bt Power over Ethernet++ (PoE++) standard for supplying devices with higher power demands, such as video and point-of-sale systems, lighting controllers, fire alarm systems, and building access systems.
The devices are a series of 60W PoE transformers with different turns ratios for output voltages of 3.3V, 5V, 12V, and 24V.
Featuring an EPCOS EFD 20 ferrite core, the B82806D PoE transformers offer DC resistance values as low as 3.5 milliohms and a typical switching frequency of 250kHz.
The transformers are compliant with UL 1446 class 130 (B) standards, are RoHS compatible, and can withstand a high-voltage test for one second between the primary and secondary sides at 1500V AC, 50Hz.
Capable of supplying powerful loads, the transformers’ high efficiency also makes them appropriate for active clamp forward converter topologies.