"Внутренний шаг времени при анализе переходных процессов слишком мал" - как не пытаюсь менять, ни чего не получается

Матрица сингулярная для AD633. Spice модель не та.

на вкладке" текст" где опции
.OPTIONS

установите RELTOL=5m

Или где?

Аська не нужна. Лучше - книжка.

А какая? Заранее весьма признателен.

Convergence defined
To do its work, Micro-Cap 9 must solve nonlinear equations. Neither people nor
computers are able to solve these equations analytically, so they must be solved
numerically. There are many techniques for numerically solving equations, but
they all rely upon a rule that tells the algorithm when to stop. Usually it is embodied
in a piece of code like this:
while (error > RELTOL*V + VNTOL and iterations < MAXITERATIONS)
{
error=Solve();
iterations = iterations +1;
}
This code says to continue iterating the solution while the error is greater than
some tolerance and we have not yet exceeded the specified maximum number of
iterations. The error itself is defined as the difference in successive estimates of
the final answer. Thus, if we get the same answer from one iteration to the next,
or at least the difference between two successive answers is less than some acceptable
tolerance then we say the solution converged, and the answer at this one
data point is deemed correct.
This criteria is checked for every nonlinear variable in the circuit. If any one of
these variables fails to converge, then the infamous message,
"Internal time step too small",

Вот не нашёл я у Амелина разъяснения смысла длинных текстов вроде того, что привёл Tay. У Разевига - тем более.
А что по-русски про P-Spice посоветуете попонятнее?

To do its work, Micro-Cap 9 must solve nonlinear equations.

Чтобы производить его работу, единая сельскохозяйственная Микро-политика 9 должна решить нелинейные выравнивания.