Hello! I am having some troubles in simulating a very common (maybe the most common) configuration for the lm3886. I didn't find any discussion about this specific issue. I hope I am not reproposing an old topic and that someone will help me 
Basically, I am trying to determine the effect of a thiele network when a capacitive load is connected (2uF || 8ohm). I also tried to include a series inductance on the load, but it doesn't change the result.
The simulation results are very unexpected, and i suspect (I hope) there is some kind of bug. I downloaded the simulation model from the TI site.
As you can see in the attached pictures (I hope they are readable ), on a transient response simulation, the presence of the thiele network gives place to a terrible ringing. And as far as I know theory tells the opposite thing.
The strange thing is that i also tried to replace the lm3886 with a LT opamp that is not unity gain stable, with the same result. It was a low power amplifier, therefore i resized the load accordingly.
Is there any flaw in my simulation?
The parasitic inductances included in the feedback network have no effect on the simulation (i tried to remove them).
Maybe someone compared the square wave transient response with and without thiele network with an oscilloscope on a real circuit?
Thank you in advance for any reply
Basically, I am trying to determine the effect of a thiele network when a capacitive load is connected (2uF || 8ohm). I also tried to include a series inductance on the load, but it doesn't change the result.
The simulation results are very unexpected, and i suspect (I hope) there is some kind of bug. I downloaded the simulation model from the TI site.
As you can see in the attached pictures (I hope they are readable ), on a transient response simulation, the presence of the thiele network gives place to a terrible ringing. And as far as I know theory tells the opposite thing.
The strange thing is that i also tried to replace the lm3886 with a LT opamp that is not unity gain stable, with the same result. It was a low power amplifier, therefore i resized the load accordingly.
Is there any flaw in my simulation?
The parasitic inductances included in the feedback network have no effect on the simulation (i tried to remove them).
Maybe someone compared the square wave transient response with and without thiele network with an oscilloscope on a real circuit?
Thank you in advance for any reply