Is the output voltage of a class-D amp half the output voltage of power supply?

[Deleted member 9685]

Is that so? How?

 

[solderdude]

Not exactly, it also depends on whether or not it is a balanced amp and or if the amp has an internal DC/DC converter (as a lot of high power car amps do)
When no DC/DC converter is present and not balanced use the following formula.
Power supply voltage (if dual supply then the +/- voltage) and divide multiply that voltage by 0.35.

When no DC/DC converter is present and the output is balanced use the following formula.
Power supply voltage (if dual supply then the +/- voltage) and divide multiply that voltage by 0.7.

When a DC/DC converter is present all bets are off.

 

[Deleted member 2944]

Multiply, not divide.

Dave.

 

[Deleted member 9685]

Not exactly, it also depends on whether or not it is a balanced amp and or if the amp has an internal DC/DC converter (as a lot of high power car amps do)
When no DC/DC converter is present and not balanced use the following formula.
Power supply voltage (if dual supply then the +/- voltage) and divide that voltage by 0.35.

When no DC/DC converter is present and the output is balanced use the following formula.
Power supply voltage (if dual supply then the +/- voltage) and divide that voltage by 0.7.

When a DC/DC converter is present all bets are off.

What about FX502S Pro which is a TPA3250 amp? Multiply the output voltage of power supply by 0.7?

 

[solderdude]

What about FX502S Pro which is a TPA3250 amp? Multiply the output voltage of power supply by 0.7?

Yes it is balanced so Vps x 0.7 = 16.8V = 70W/4Ohm 35W/8Ohm