Other Parts Discussed in Thread: TPA3244
I think that PFFB circuit can damage on input stage(INA/INB/INC/IND) of TPA3244.
When TPA3244 board with PFFB circuit is turned on the power, the fault of TPA3244 has occurred. (/FAULT pin=low)
For example, one(IND) of the input pins has a different bias level from other input pins like below pictures. so, the fault has occurred.
When TPA3244 board without PFFB circuit is turned on the power, the fault of TPA3244 has not occurred. (/FAULT pin=high)
Are there any recommended solutions and ideas?
The component values of PFFB circuit are same as the recommended component values except for R_in(820ohm instead of 2.7kohm).
Picture 1. INA(yellow), INB(blue)
Picture 2. INC(yellow), IND(blue)
