The performance of an LC averaging filter at the input stage of an off-line power converter, with and without additional damping, is compared under common transient disturbances. Results suggest that the bulky and costly damping may not be justified for the improvement in performance.

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Some low-noise applications may require the power supply output ripple voltage to be less than 0.1 percent of the output voltage. These low ripple requirements easily can translate into filter attenuations of significantly greater than 60 dB, which cannot be practically met with a single stage.