It is generally provided in datasheet about efficiency waveform with different outpower, if you need to know how to measure it ,please refer to the below app notes about the guideline for measuring the audio power amplifier performance:
Calculate efficiency is very difficult at the class-D. PCB layout and induction...are very important for the efficiency. So, in first design, please see datasheet. If you are veteran, history is very important for your calculate.
Of coures, I have seen it, it was just a result. But, what I want to get is the calculate formula, then I can use the formula to improve the efficiency. Thanks!
