Generally speaking, most power ferrite materials are designed for low-loss power systems at frequencies under 500 kHz and operating temperatures from 80° to 100℃. Observation of development trends within the electronics market indicate a growing demand for miniature power supplies with higher power density and increased current output Two basic requirements have emerged in recent years in the ferrite-materials industry and are necessary to meet power electronics specifications. The first is that new ferrite materials must be developed to offer optimal performance for power converters that require frequencies up to 1 MHz and operating temperatures to 100℃. The second is that ferrite materials need high-saturation flux density up to 100℃ to be acceptable for high-current output chokes. An understanding of the basic principles of selection for ferrite-core materials and shapes will allow the designer to make the best choice for a successful design.
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