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Class D audio amplifier supply?

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grizedale

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If a class D audio amplifier is running of a -24V, +24V supply...........can i simply change this to a 0V, 48V supply?
 

grizedale

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Hi

is that because the control circuitry has to be referenced to 0V?
 

leo_o2

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It can be changed to 0V, 48V supply. And in the same time, the reference can be changed to 24V.
It is also equal to VDD/2.
In fact, voltage is relative value.
 

FvM

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There are several possible issues.
- the input will most likely use the 0V as return. You'll need a differential amplifier to change the input reference to -24V without injecting interferences to the input
- a half bridge output stage uses 0V as output return, or would need an output capacitor
- depending on the internal supply topology, 0V possibly draws DC current due to an asymmetrical design
 
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