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TPA6404-Q1: about DC diagnostics

Part Number: TPA6404-Q1


customer use automatic DC load diagnostics, and sent below command: 0x2b=0x03;0x04=0x00

diagnostics result is normal. the load is 1-ch connect speaker(4ohm) other three channel are 4ohm resistors.

He tried several times, found that the curren of power is different in every test. and the thermal of TPA6404-Q1 also different.

with 24V power, current sometimes is 0.5240A, sometimes is 0.5982A.

So, we need your help about that what the process of DC diagonstics and why there have different current consumption?