Planar transformers are constructed with windings integrated into a PCB that is then sandwiched between two ferrite cores. The major benefit of this design is a reduction in size and weight and low leakage inductance.
Planar transformers provide higher efficiency, increased reliability, smaller size and lighter weight over their classic steel lamination, wire wound counterparts. Moreover, Planar transformers offer several benefits such as up to 3 times the power density, superior repeatability, high reliability, superior heat dissipation, a 97-99 % efficiency without volume increase and at a weight that’s almost half that of equivalent wire wound transformers.

Spec Sheet: Planar Transformers

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