The used NiZn core material allows the use of the power inductors WE-PMI series up to 10 MHz. The rated current is defined for the common self-heating of DT = 40 K with respect to the ambient temperature. The saturation current of the power multilayer inductors (such as WE-PMIs) relates to the typical inductance drop of –30% from the zero current inductance. The compact power multilayer inductors in 1008 package (2.5 mm x 2.0 mm x 1.0 mm) not only offer high rated currents (up to 2.4 A), but also a lower DCR than comparable to standard multilayer inductors types. The dimensions of the storage chokes required can therefore be reduced by up to 90%. Switching controllers like the Micrel MIC2285 already work with 4 MHz. In order to allow minimization of the coil volume, the switching controller IC is driven at ever-higher switching frequencies. This is where the power multilayer types apply. Wired components are out of the question in these orders of magnitude.
#FERRITE CORE INDUCTOR CROSSOVER COIL PORTABLE#
The miniaturization of SMD components, especially inductors, is a widespread trend in portable devices, as it is especially storage chokes that frequently require the most space. 2.34: Power Multilayer Inductors image source: Würth Elektronik WE-PMI