LM25149-Q1: PSpice Simulation Won't Converge

Jackson Carmichael

Part Number: LM25149-Q1

Hello,

I'm pretty new to PSpice, but what I'm trying to do with the below circuit is run a line test that waits until the system has reached 6V, jumps to 17V quickly, and then measures how the system responds.

Here is my circuit:

I based it off of this Webench design:

Here is the error that stops my simulation when I try to run it:

Here are my simulation profile settings:

Is there anything else I should try to get this simulation working? Also, is there any additional setting you would need to see before properly assessing what I should try next?

Thank you!

over 3 years ago

0 Orlando Murray over 3 years ago

TI__Mastermind 22301 points

Hi Jackson,

Your steady state variable is 0, this means it will go through a start-up soft-start.

The current source/sink as load will draw current from the capacitor and inductor before the controller starts regulating. This can cause negative VOUT and SW and might mess things up.

If you change the load to a resistive load does it converge?

Let me know,

-Orlando