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Old 13th May 2012, 08:33 AM   #11
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Default Minimizing Switching Regulator Residue in Linear Regulator Outputs

Ferrite beads before/after ...
Just saw this on YouTube -- a topical lecture given by Linear Tech:
Minimizing Switching Regulator Residue in Linear Regulator Outputs - YouTube
Linear Technology Video Channel - Minimizing Switching Regulator Residue in Linear Regulator Outputs

"Linear regulators are commonly employed to post-regulate switching regulator outputs. Benefits include improved stability, accuracy, transient response and lowered output impedance. Ideally, these performance gains would be accompanied by markedly reduced switching regulator generated ripple and spikes. In practice, all linear regulators encounter some difficulty with ripple and spikes, particularly as frequency rises. This video, excerpted from LTC Application Note 101, explains the causes of linear regulatorsí dynamic limitations and presents board level techniques for measuring and improving ripple and spike rejection."
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Old 13th May 2012, 09:33 AM   #12
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Can't say I noticed a "tired" sound when using an LM317T.

I built a SALAS Shunt Reg in the end.

Mezmerize DCB1 Building Thread Post #501

Last edited by KatieandDad; 13th May 2012 at 09:36 AM.
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