I designed a simple board based upon the ds of the TPA3118. Here the actual schematic:
When I power the device, even with no input signals, coils (L1..L4) and op-amps (IC1..IC2) reach a quite warm temperature:
I understand it's not such an high temperature, but I would like to understand if it's normal. Especially for op-amp I don't understand what they are doing. With no input signals there's only a DC offset (provided by R4 and R6). The coils are NRS8040T100MJGJ (10 uH, 3.1A, 34 mOhm, 22 MHz).
I checked with the oscilloscope and there are no oscillations in the input pins. Of course I have the high-frequency "PWM" on the coils - here I can understand the heat.
I measure 135 mA at 24V in this condition. The board is working. But I want to be sure this is its correct behavior or I missed something in my design.