Simulation Speed LTSPICE

[ArnaudMARTIN]

Hello,

I have a problem with a amplifier Class D simulation.
It works, but the simulation freeze during a long time after few µs. I see a simulation speed at fS/s .

Could you help me ?

Have a good day,

Arnaud MARTIN

 

[stenzer]

Hi,

have you tried to change the solver to "Alternate"? Can be changed in the "Control Panel" -> Tab "Spice" -> "Engine" -> "Solver".

Further, you might change the tolerances, see [1].

[1] http://ltwiki.org/index.php?title=Convergence_problems?

BR

 

[dick_freebird]

You are probably fighting transient convergence challenges.
Hard switching nodes fed back to slow circuitry is one such.
Use of too-ideal behavioral sources and active devices with
their parasitics neglected, can also be trouble.

I like Euler method because it is more "self-damping" than
TRAP or TRAPGEAR.

 

[ArnaudMARTIN]

Hello,
@stenzer et @dick_freebird Thank you for your answers.
I change the solver to "alternate",and it fix the problem of freeze. I don-t understood the difference between both solver but it works.

@dick_freebird How can i choose a euler method in ltspice ?

Have a good day.

 

[FvM]

See https://groups.io/g/LTspice/message/112454