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Do all fans routinely need LC filtering

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cupoftea

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Hi,
We will use some of these in our 4kW SMPS...

Fan

As a routine , should they always feature an CLC filter right by their input?, or else they might put high di/dt currents in the general PCB ground which may interfere with controller?
 

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I would imagine you'd be better off with measurement
than with speculation. Does being a good neighbor
add value? That's somebody else's call.
 
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