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LM2596 Controllable Buck Converter Switching Noise on Signal

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Le_Bassiste:

--- Quote from: syntax333 on May 03, 2019, 11:02:16 pm ---Is this ringing on signal normal for a buck converter or is this due to power module being a counterfeit?

--- End quote ---

no, this is not indicative of a counterfeit part. its telling you that the buck is running in discontinuous mode (DCM).
of course, your power module may still be consisting of counterfeit parts, though  :-//

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