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Class D Switching Power Amplifiers and Power D/A conversion

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Old 23rd April 2019, 06:56 PM   #431
chermann is offline chermann  Austria
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One issue encountered in single-ended (SE) class-D amplifier designs is supply pumping. Power-supply pumping is a rise in the local supply voltage due to energy being driven back to the supply by operation of the class-D
amplifier. This phenomenon is most evident at low audio frequencies and when both channels are operating at the same frequency and phase. At low levels, power-supply pumping results in distortion in the audio output due
to fluctuations in supply voltage. At higher levels, pumping can cause the overvoltage protection to operate, which temporarily shuts down the audio output. Several things can be done to relieve power-supply pumping. The lowest impact is to operate the two inputs out of phase 180 and reverse the speaker connections. Because most audio is highly correlated, this causes the
supply pumping to be out of phase and not as severe. If this is not enough, the amount of bulk capacitance on the supply must be increased. Also, improvement is realized by hooking other supplies to this node, thereby,
sinking some of the excess current. Power-supply pumping should be tested by operating the amplifier at low frequencies and high output levels.

datasheet TPA3122 - supply pumping
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Old Yesterday, 12:41 AM   #432
troystg is offline troystg  United States
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"Also, improvement is realized by hooking other supplies to this node, thereby,
sinking some of the excess current."

Sounds like more devices with different frequency spectrums would help.

Ill try hooking all 4 up to one supply and see how it goes.
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