Tool/software:
Dear Engineer:
When I used your company's LM4950 amplifier chip, I found that two pop sounds were generated when it was turned on, and there were two situations for the first pop sound. The first situation is shown in the figure below:
Among them, "①" is the pop sound signal generated when I connect the power, and "②" is the pop sound generated by my system after a certain delay when the shutdown pin of the power amplifier chip is pulled high and the chip is working normally. In this case, the first POP sound is relatively small, but sometimes the second situation will occur, and the first pop sound will be relatively loud. The first pop sound of the second situation is shown in the figure below:
In this case, the first pop sound can be clearly felt in the earphone. Why is the first pop sound so different in volume when the power is turned on? How can I solve this problem? The following is the circuit diagram of the power amplifier chip and power supply part.
