The EQ core design is derived from the ER and PQ. The range is optimized for use in compact AC/DC notebook adapters and DC/DC converters. For instance, the EQ30 has the capability to handle a power range of 50 to 70 W (fl yback topology) in an enclosed casing of a notebook adapter or 100 to 150 W in low profi le DC/DC converter . The advantages of EQ cores are a simple core shape, round centre pole, high Ae value , a large winding window, low profi le and a large surface area for heat dissipation.
The ETD core design is a further development of E cores. They are optimized for use in SMPS transformers with switching frequencies between 50 and 200 kHz. 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 types and can be handled on automatic equipment.
Economic Flat Design (EFD) power transformer cores offer a signifi cant advance in circuit miniaturization. Their low build height and high throughput power-density make them ideally suited to applications where space is at a premium. Throughput power of a ferrite core transformer is essentially proportional to its volume. So the transformer is one of the main limitations in a DC-DC converter's size. Now, with the introduction of the EFD system, a signifi cant reduction in transformer core height has been achieved. EFD transformer cores combine both extreme fl atness with a very high throughput power-density for frequencies up to 1 MHz and higher. Every transformer, based on the EFD range, has a lower building height than any other existing low-profi le design with the same magnetic volume. This is achieved by placing the centre pole of the core always in the centre of the fi nished transformer, thus making maximum use of the winding area.
The PH core range consists of potcore halves specially designed for use in proximity switches. Their shape is derived from the IEC standard P-core range. Outside diameters are adapted to fi t standardized sizes of proximity switch housings. Since the cores are used as halves, their height is increased to accommodate the winding. A complete range of coil formers is available.
The EP/LP core range was specially designed for wideband transformer applications where low build height is a must. The board area occupied by the assembly is almost a square, allowing high packing densities on the PCB. The bobbins have two rows of pins allowing easy design of multiple output transformers. Cores are available in high permeability materials, including the new low THD material 3E55, for wide band transformers and in power materials for small power transformers.
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