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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?
 

Hi

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

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.
 
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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