The ETD59/31/22-3F3 is a Transformer Core made with material grade of 3F3. The ETD core design is a further development of E core. It is optimized for use in SMPS transformers with switching frequencies between 50 and 200kHz. The designation ETD (Economic Transformer Design) implies that this design achieves maximum throughput power related to volume and weight of the total transformer. Shielding is somewhat improved compared with E cores. The matching coil formers are suitable for many winding type and can be handled on automatic equipment.
