6 Summary

The application report discusses the low-frequency line driver design to prevent pop noise. If the audio system has the pop noise, it usually takes time to find out the root cause. The methods for the pop noise solving, depending on the woofer application desired, are addressed in the application report by either decreasing the termination resistor or increasing the feedback network resistor from simulation to real PCB board’s waveform. However, if you able to separate the power from SOC, using correct power sequence can effectively prevent the pop noise and keep the lower frequency (>20Hz) response flat.