Minimizing Input Filter Requirements
Military power supplies frequently require conducted susceptibility testing
per MIL-STD-461. Essentially, this test consists of treating the power
supply as a filter, and measuring the attenuation of input signals as a
function of frequency. This paper describes the relationship between
open-loop gain of the voltage feedback loop and input filter
characteristics. Design techniques to meet conducted emission and conducted
susceptibility requirements are presented. Design guidelines are presented
and topologies and operating modes that aid in meeting the requirements are
suggested.
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