Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
hi
i have used op27A opamp part in converter circuit it shows time step too small error, so kindly help me to solve the issue.
One specific case of this means that there is something that wants to change instantly in your simulation (vertical line on a graph) when the physical component does not allow instantaneous changes (like current through an inductor) and the simulation can't deal with it. Sometimes the way to fix this is to approximate the vertical step by a steep slope that the simulator can deal with.Hello,
There is a model used in your simulation that is not in the library. You will have to supply the model if you want other people to be able ot run your simulation.
You will get time step errors when the derivatives in the numerical solution become too large or unstable. What this means is that even with the smallest time step being used the derivatives can not be contained properly or change too rapidly.
A solution that works sometimes is to make the maximum step size smaller. This sometimes works because it allows the simulator algorithm to be able to control the derivatives leading up to the problem derivative(s) and thus when it gets there again it finds a naturally smoother solution and so is able to solve it with a reasonable time step.
This doesnt always work because sometimes the solution changes too fast (could be a 'shock') no matter what we do with the algorithm. The alternative is to find the problem time constant and try to slow it down a little without changing the overall simulation by too much. The odds are that slowing it down slightly wont change the overall results too much because the time frame over which the solution exists is typically very small compared to the larger time constants.
One specific case of this means that there is something that wants to change instantly in your simulation (vertical line on a graph) when the physical component does not allow instantaneous changes (like current through an inductor) and the simulation can't deal with it. Sometimes the way to fix this is to approximate the vertical step by a steep slope that the simulator can deal with.
You do it by modifying the circuit, not by literally telling the simulator to make treat a particular vertical slope as ramp. Same thing as slowing the time constant I guess, but slightly different mental approach which is what I did the last time I had to do this.Hi,
But how do you tell the simulator to approximate the vertical step with a steep slope. You cant, all you can do is slow down the time constant.
This is a common problem in LT SPICE. Now I wish I could remember......time step too small error,
hi
i have used op27A opamp part in converter circuit it shows time step too small error, so kindly help me to solve the issue.