I checked LMZ31530 webench simulation.
The phase margin value is listed in operating value page in initial condition. However it is deleted when I edit circuit component.
Is it possible to check phase margin value in any condition? If it is impossible currently, can you fix this phenomenon?
Best Regards,
Kohei Sasaki
Kohei,
I need to understand what you were trying to do before I can say if there is a solution for the problem. If you were simply changing a value of a component, the circuit calculator would recalculate the phase margin once the change in the component was made. This the way the WEBENCH® has worked for quite some time.
If you used the Edit icon:
You were prompted to save the edited copy under a new version and you can then edit the topology of the circuit. This will eliminate the connection between this design and the circuit calculators because the calculators will not know what changes you have made to the circuit and how this would effect the overall operating point. You should not use this to edit component values, only to add circuitry to the design that was created by WEBENCH®.
If you only need to edit a value or type of component, simple select the BOM and click on the green box next to the component you wish to change. Once you have finished with the update, the circuit will recalculate the OpVals based on the change made.
I hope that this information answers your question. You can change component values in the Edited copy as well, but you will lose the connection to the circuit calculators and will only be able to run SPICE simulations on the circuit to see the performance of the circuit. You are not currently able to simulate the Phase Margin of the device after you have entered the Schematic Editor.
