FeNi powder cores
Soft saturation keeps inductance usable at high bias. Toroid and custom geometries; material data is published in the data sheet.
Application · Power delivery
Magnetics for DC-DC Power Modules, VRM and POL
High current, low profile, tight transient response. The core is chosen for behaviour under DC bias and loss at the switching frequency — not for its catalogue inductance at zero bias.
DC bias and core loss in DC-DC stages
- DC bias: check the effective inductance at the rated operating current and at the transient peak current. A part that measures well at zero bias can behave differently at 60 A.
- Loss split: core loss and DCR trade against each other, and the split depends on ripple and frequency rather than on core size alone.
- Thermal: the inductor sits beside the FETs, so the loss budget is also a temperature budget — and the material has to keep its properties there.
Materials that fit
Co-fired molded inductors
Low profile with high current density. Inductance, saturation current and DCR are confirmed with your build.
Ferrite cores
Where current is moderate and frequency is high, a gapped ferrite can be the cheaper answer.
Design notes
