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All switching amps work on loop feedbacks.

Hi.

Since I don't know which model of Panasonic switch mode amp is it,
I can only assume it is a delta-sigma modulator with 1-bit quantizer, similar to what Sharp is using.

If my assumption is correct, then there is definitely feedbacks looping from the exit of the switching amps back to the delta-sigma modulators to to generate an error voltage.

The feedback voltage is used to compensate the nonlinear behaviour in the switching power stage, e.g. non-overlap time, mismatched rise/fall time, & propagation time. It also help to reduce sensitivity to both DC & transient changes of the power supply voltage.

c-J


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