A custom magnetic program almost always starts with a constraint that no catalogue part satisfies. A 200 kHz LLC stage needs 22 uH at 6 A of DC bias, the board leaves 4 mm of height above the surfac...

Two power inductors can run at the same 100 kHz switching frequency and the same 120 mT peak flux density, share the same core size, and still differ by a factor of two in core loss. The Steinmetz f...

A core loss budget that predicts 12 W while the bench measures 19 W is rarely a bad material. It is usually the Steinmetz equation used outside the conditions it was fitted for, and the correction c...

Three numbers decide whether a ferrite transformer survives its first thermal test: the peak flux density inside the core, the ambient temperature in the enclosure, and the saturation limit of the ma...

A 30 W auxiliary supply for an industrial control board, a 25 W LED driver, or a compact flyback in a smart meter — size any of these and the EF20 ferrite core lands on your shortlist within minutes....

A 1,200 W industrial power supply without power factor correction can draw a severely distorted line current, wasting energy and adding harmonics that disturb other equipment on the same grid. A PFC ...

Measure a 22 uH output choke on the bench at light load and it reads exactly as designed. Run the same converter at full load, with 8 A of direct current flowing steadily through the winding, and the...

A common-mode choke on the input of a 150 W industrial power supply has to hold useful impedance from the 150 kHz switching frequency up into the tens of megahertz, where radiated emissions are measu...

Many engineers start a switch-mode power supply design with the same question: which magnetic material should carry the transformer and inductor cores? For a 150 kHz LLC converter, a 60 W flyback, an...