IEC 63093-9 Ed. 1.0 b:2020 Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 9: Planar cores
standard by International Electrotechnical Commission, 04/16/2020
Full Description
IEC 63093-9:2020 specifies the shapes and dimensions of ferrite cores for inductive components (transformers and chokes), whose the coil is typically made of multi-layer boards (or the coil is part of the motherboard), and the effective parameter values used in calculations. This document gives guidelines on allowable limits of surface irregularities applicable to planar-cores as well.