TDK EPCOS B82806D0060A** series transformers

TDK has released a series of EPCOS transformers designed for an output of up to 60 W, which are therefore suitable for PoE++ according to IEEE 802.3bt. The B82806D0060A** series comprises four types with different turns ratios for output voltages of 3.3, 5, 12 and 24 V. The SMD components have dimensions of 30 x 22 x 11.4 mm and are designed for a wide range of operating temperatures from -40 to +125°C.

The electrical insulation of the RoHS compatible transformers complies with UL 1446 class 130 (B) and can withstand a high-voltage test between the primary and secondary sides at 1500 VAC, 50 Hz for 1 s. The low DC resistance values — depending on the type — can be as low as 3.5 mΩ. This results in high efficiency, making the transformers suitable for active clamp forward converter topologies. The typical switching frequency is 250 kHz.

An increasing number of devices offer LAN connectivity for communication purposes. The obvious solution therefore is to power them via the LAN cable as well (Power over Ethernet), so that no separate power supplies are necessary. The IEEE 802.3bt (PoE++) standard, which is designed for four pairs of cables, has been developed in order to supply devices with a higher power demand. The EPCOS transformers are designed specifically for this application segment. Typical applications are video and POS systems, but also lighting controller systems, fire alarm systems and access systems that are used in building management.