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Epcos rolls out smaller interface transformers for DSL equipment

Posted: 25 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:epcos? interface transformer? transformer? dsl equipment? ep13?

Epcos announced that they were able to make interface transformers for DSL equipment even smaller. Two years ago, Epcos said, these transformers were downsized from EP13 to EP7 cores. Today, the new B78416 series, which is based on EP5XL cores, is 25 percent smaller in area (64.5mm?), 31 percent lower in height (7mm) and 48 percent smaller in volume (451.5m3) in comparison with the EP7-based transformer.

The company explained that whereas the ferrite material was the driving force behind the switch from EP13 to EP7 cores, this most recent advance is the result of optimized core design.

Direct comparison of type B78416A1850A003 (EP5XL) with its predecessor B78417A1764A003 (EP7) shows that despite its smaller core volume, the new transformer has the same longitudinal balance and total harmonic distortion (THD) values while satisfying the leakage inductance requirements. Only its ohmic resistance is higher. The tiny transformer can even satisfy the requirements for surge voltage strength and is designed for 2.5kV/2/10?s or 1.5kV/10/700?s. The higher ohmic resistances can be compensated by next-generation line card chips.

Epcos is currently developing variants for several DSL chipsets. Customer-specific versions are available upon request.

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