Compact current sense transformers

2 April 2008 Passive Components

Epcos has developed two series of current sense transformers that – thanks to their space-saving SMT design – are particularly suitable for compact DC-DC converters. They have dimensions of only 8,33 x 7,11 mm and 4,7 x 3,5 mm, respectively. The primary winding is already integrated in all types, thus saving development and placement times. Both series cover winding ratios from 1:20 to 1:125.

The first series represents a compatible solution for existing designs based on an EE5 core. The DC resistance of the primary winding is 0,8 mΩ and the rated current is 20 A for all types of this series. They have a test voltage of 500 V a.c.

The second series was developed as a miniature variant with the significantly more compact E4,2 core. The primary winding is integrated in the coil former in a space saving configuration. Its DC resistance is 2,5 mΩ and its rated current is 7 A. The test voltage of these types is 360 V a.c.

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