this concerns low power audio amp ic with output of 600mw to 11w, all this amps have either bootstrap pin, if none a feedback circuit is provided.
my question is what would be the outcome of the sound produced when possible action is taken:
1. the bootstrap pin is not used with no feedback circuit provided
2. the bootstrap pin is unused but with feedback circuit provided
3. the bootstrap pin is used together with a feedback circuit
if my memory serves me right, the bootstrap pin is used to pull up the voltage to supply level or a little bit higher and this also serves as a feedback path. that pin is connected to the base of the driver transistor.
the reason why am posting this query is because i saw a post saying that he remove the cap connected between the output and the bootstrap pin and the sound came out better. i just can't remember where i saw that post.
on my next post i'll try to give the proper answer to your question
the bootstrap pin has 2 functions.
1. a capacitor can be connected between the output and this pin. the cap is used to set the low freq. pole
2. a resistor can be connected between the supply rail and this pin. the resistor is used to set the drive current of the output stage.