Page 11 - PEN eBook December 2022

Cover Story — Design

From a layout point of view, it must be ensured that the primary and secondary sides are capacitively
decoupled from each other. The input and output capacitors (C and C ) must be placed as closely
IN OUT
as possible to the input and output terminals of the module, respectively. This minimizes the

current-conduction loops, limiting the area of copper, which experiences large changes in current
during operation of the module. Inserting distance between the power module and the input filter
reduces the effect of radiated coupling from the switching circuitry and the filter capacitor C in the
F
LC input filter. In practice, a distance of roughly 2.5 cm is sufficient. More detailed information on
the layout can be found in the datasheet of the FIMM in the section “DESIGN EXAMPLE”. A layout
2
recommendation for ALTIUM can be downloaded from the online catalog in the “DOWNLOADS”
section.

References

▶ RedExpert Filter Designer
1

▶ Würth Elektronik. (September 2022). “MagI³C-FIMM Fixed Isolated
2
MicroModule.” Datasheet.

Timur Uludag, Würth Elektronik

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