LLC resonant transformers yield good efficiency

19th July 2017

Alice Matthews

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A series of offline transformers which use LLC Resonant Half-Bridge topology have been released by Wurth Electronics Midcom; MID-LLCEPC. With the low switching losses of the LLC topology, the MID-LLCEPC series yields very good efficiency, which makes the topology attractive with higher power levels.

“Our package used for this series was designed with an innovative crimp terminal, which allows for better solder integrity on Litz wire terminations than is traditionally seen in the market place,” said Dean Huumala, Product Marketing and Development Manager at Wurth Electronics Midcom.

This series, developed on the EPC40 package from Wurth Electronics Midcom, is capable of power levels up to 400W. All four of the parts in the series are designed to take power from a PFC boost converter at a voltage ranging from 340-420VDC switching at 70-140kHz.

These new EPC-style offline LLC transformers are best suited for LLC resonant converters, high efficiency switch-mode power supplies, display panels, telecom circuits, and audio applications.