Other Parts Discussed in Thread: LM2842
Tool/software: WEBENCH® Design Tools
I have a question regarding the stability simulation and analysis of the LM2842.
Simulated with Webbench the Bodeplot give a phase marging (0db) of ~60°. But there is no gain margin given because these phase never reaches 0°. [see picture at the end]
The configuration i took from the evaluation board.
We build different cofigurations (12V -> 5V)/(5V -> 3V3)/(5V -> 1V2) but nearly all have at different load points the problem that the phase does not reaches 0°. Measurement was done with the Bode 100.
In my understanding it is essential for the stability to have a phase marging (0db) of >45° and a gain marging (0°) of ~20db. It there an explenation why its not possible to reach 0° and why thats okey with that configuration?
Thank you for your help
Alexander Fitzner