How to limit current consumption for integrated class D amp?
The increase in power consumption is simply a result of the amplifier delivering power to the speakers.

You could:


increase the impedance of the speakers, then for the same signal less current will flow. This also means less power is delivered to the maximum volume will be lowered.
decrease the signal gain, the amplifier itself does not seem to have a setting for this. Looking at the input stage (datasheet page 5) is does appear that the input series resistors (the 50 ohm resistors) are part of a gain-setting network. So I would suggest making the 50 ohm resistors a factor 2, 5, or even 10 higher and see what happens. It is unclear what the on-chip resistor values are around the amplifier so you will have to try and see if that helps.


Edit: it appears increasing the value of the input series resistors doesn't help much. Then you could try to attenuate the signal like so:







simulate this circuit &ndash; Schematic created using CircuitLab

C2 is needed in order to not disturb the DC biasing voltage on the amplifier.

Note that you need this circuit for both left and right channels.

There also seems to be some setting possible with the CNC pin and the resistor and capacitor connected to it. But due to the Chinese text I cannot understand what that exactly does.