TDK-EPC, a group company of TDK Corporation, has developed a new series of EPCOS EP5 SMT pulse transformers. They are used to couple gate-drive circuits to MOSFETs and IGBTs operating at switching frequencies within a range of 150 kHz to several MHz. These transformers are available with a wide range of turns ratios, polarities and outputs.
Thanks to the use of miniaturized EP5 cores, these transformers have dimensions of only 8.1 x 6.7 x 5.4 mm³. As several transformers are usually used in a circuit, the size reduction of the transformers results in significant space savings on the circuit board. Thanks to a special winding technology, parasitic capacitances between windings are only 25 to 95 pF, depending on the type. Stray inductances are likewise low. They range between 0.9 and 2.5 µH. Short-term dielectric strength is tested to 1500 V DC for all types of the B82804A* series. These components are designed for ambient temperatures of up to 85 °C and operating temperatures of up to 125 °C. Their terminal configuration and pin assignment correspond to the industry standard.
The main applications of these new transformers are half- and full-bridge converters as well as in frequency converters or inverters.