Erratic simulation

Schematic Simulation (Ngspice)
1

Hello,

I copied the drivers sch that is available as exemple and modified it to have PWM input.
While I manage to run the simulation once, it suddenly did not wanted to work later.
And of course the error console is as usually complete non-sense

That is not the first time that happened and really frustrating. Any idea ?

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image1464×532 72.1 KB

2

H-Bridge_PWM.zip (23.1 KB)
Attached is the SCH with all needed files.

3

That’s wrong. See 1).

There is never a ‘suddenly’.

  1. Note: No compatibility mode selected!

The device models require compatibility set to PSPICE and LTSPICE

  1. The bridge has input nodes Vin22, Vin23.
    Your OpAms have output nodes Vin1, Vin2.
    ??
4

Hi Holger and thanks for your usual prompt help.

Indeed my labels where wrong. That’s the usual mistake when I play with multiple un-do.

Concerning the compatibility mode, I swear I haven’t changed anything. The model was running, then I had this error and perhaps I changed smg in order to make it running.

Nevermind it’s now working. Not from the electronic point of view but that’s another story. (It was running also from a physics perspective before, yes yes!)