This power supply filter is designed for switch mode power supplies switching at or above 200kHz. Files can be found at: Dropbox
Common mode noise must be handled externally before the power cable reaches the filter. This can be done by wrapping two-conductor wire around a toroid several times.
Schematic rev 1:
The filter is composed of a lower-frequency 5th order Butterworth lowpass filter, followed by a higher-frequency lowpass filter composed of a ferrite bead and a feedthrough capacitor.
The use of a separate lower-frequency and higher-frequency filter allows the use of lower SRF inductors in the lower-frequency filter.
If higher-frequency performance is unnecessary for your use case, the ferrite bead and feedthrough capacitor can be bypassed to increase the current rating of the filter.
The use of 5Ω resistors in series with the filter capacitors dampens the filter and allows the filter to maintain its performance with a wider range of supply currents.
Mechanical drawing rev 1:
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