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Class D Switching Power Amplifiers and Power D/A conversion

Control gain by changing supply voltage?
Control gain by changing supply voltage?
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Old 18th June 2008, 11:14 AM   #11
oldeurope is offline oldeurope  Germany
diyAudio Member
Join Date: Mar 2008
Default yes

Originally #1 posted by preiter
Since a class-D amp works by switching on and off the supply voltage, would it be possible to control the gain by changing the supply voltage?

Would this be a viable form of volume control?
Yes, it is. And it is excellent.
See this one: link


translated by google

Full dynamic range of the PWM at low volume settings.

Kind regards,
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Old 18th June 2008, 12:30 PM   #12
phase_accurate is offline phase_accurate
diyAudio Member
Join Date: May 2002
Location: Switzerland
It only works on open-loop designs. The original implementation was in the TacT amplifier (using a full-bridge output topology)where a lot of effort was made in order to get a supply voltage that is

1.) Controllable and
2.) very clean

TacT's IP was later bought by TI and their staff was recruited as well.


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