The EPCOS B82806D0060A series has four types of transformer with different turns ratios for output voltages of 3.3 V, 5 V, 12 V, and 24 V. The surface mount components have dimensions of 30 mm x 22 mm x 11.4 mm and are designed for a wide range of operating temperatures from -40 °C 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 V AC, 50 Hz for one second. The DC resistance values – depending on the type – can be as low as 3.5 mΩ, which gives higher efficiency, making the transformers also 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 and powering them via the LAN cable using Power over Ethernet means no separate power supplies are necessary. Existing systems with two pairs of cables compliant with IEEE 802.3af (PoE) and IEEE 802.3at (PoE+) are designed for outputs of 15 W and 30 W, respectively.
The IEEE 802.3bt (PoE++) standard for four pairs of cables was developed to supply devices with a higher power demand and the new EPCOS transformers are designed specifically for these applications such as video and POS systems, but also lighting controllers, fire alarm systems or access systems that are used in building management.