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Class D Switching Power Amplifiers and Power D/A conversion

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Old 27th August 2011, 07:38 PM   #1
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Default Power supply oscillation and Class D?

Hi,

Supposing an SMPS that supplies a Class D amplifier is poorly designed and has a feedback loop problem, manifesting itself as a 3KHz sine wave oscillation (peak to peak = 10V) imposed on its v(out).

Could a Class D amplifier filter out the power supply oscillation and stop it from ruining the music sound.?
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Old 27th August 2011, 08:18 PM   #2
Pafi is offline Pafi  Hungary
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Not perfectly. And avoiding PSU oscillation is simplier than building a very tolerant amp.
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Old 27th August 2011, 08:37 PM   #3
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What smoothing capacitors do you have on the output ?
What is the switching frequency of the SMPS?
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