ltspice
I am unable to run ltspice simulation. I have tried changing the solver to alternate, adjusting Gmin and Trtol, Changing integration method. Always get the same error.
Error message: Analysis: time step too small; initial timepoint: trouble with schmitt-instance a:u1:4
Suffixes in LTspice are not case sensitive, so your switch's off resistance Roff=1M is actually 1 milliohm not 1 Megohm. Change it to Roff=1Meg and it will work.
Without a switch you get several thousand Amps because the initial conditions are calculated at DC and inductors are considered to be short circuits. The inductor in your circuit has close to 150V across it, so the initial DC current is very large.
Your circuit would just work as a square wave output if you tried to prototype it, as you are connecting the inverting input to GND and driving the non-inverting input with a couple of volts. In this configuration, you are using the open-loop gain which is very large and it will always saturate the output of the opamp.
I'm not sure if there is a problem in the SPICE model, but I know that trying to go out of the voltage range of the part is causing the simulation to crash.
Try the following circuit and let me know if it runs. It's just a buffer configuration. I also added some offset to the V1 sine wave so that the output will never go negative.
Good luck!
Best Answer
The solver probably doesn't like the open ports SDCOM and SD on U1. If they really are supposed to be open, put a 1e6Ω or 1e9Ω to ground (or whatever value they should be set to). This helps the solver find the value on those ports.
They are probably high impedance to a gate of a mosfet or something like that, if so, its either a floating net or close to it, floating nets are hard to solve for, so you need a current and a voltage so the solver can solve the net.