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On 05/07/2023 23:57, mliccione89@... wrote:

I'm trying to use the ISL70444SEH model and a basic circuit to confirm that the model works correctly before moving on to anything more complicated. I'm having issues with the simulation. The sim fails to run and I get the error "Time step to small, etc....".

Any help is appreciated.

It helps if you upload a schematic that actually runs. You have a ".lib ISL70444SEH.lib" directive in the schematic, but the model file you uploaded is "ISL70444SEH.cir" and there are no analysis directives.. However, when I change the .lib directive to match the file name and add a .tran directive, I don't get initially "Time step to small, etc....". Instead, I get "Analysis failed: Iteration limit reached", and there are a bunch of errors in the ErrorLog, concerning the diode models. I am running LTspice 17.1.9, you may have a different version.

I made minor changes to the model file and added ".options cshunt 1e-14", and the analysis now runs fine. I have uploaded a working schematic to Files > Temp.

You should note that although the datasheet says "unity gain stable", the circuit is barely stable with 8dB peaking at unity gain. I added a bit of compensation to help a bit with that.