In conjunction with the increased use of GaN semiconductor, which can operate a high frequency, higher frequencies for switching power supplies have become feasible. Ferrite materials are used in transformer products, but core loss (iron loss) varies greatly depending on the driving frequency, and they are key components in transformer design. This article presents information on the features of PC200 material, which was developed by using GaN, and key points concerning its use.

Apart from miniaturization, improved efficiency is the most important development goal in the design of power supply units. And ferrite cores are the decisive factor for efficiency. TDK has developed a new ferrite material and improved geometries for the core designs.