Hello,
I am running output ripple analysis on LM21215A power converter. the simulation runs from 100Hz to 1MHz. I can't find any option on Webench to change this frequency range, to 100MHz. Also, how can I save my custom design in webench and recall it when I need to re-run the simulation with changes?
Hi User,
Device LM21215A as per datasheet supports a maximum frequency of 1.5MHz as shown in image 1 below.
Image 1
Desired frequency in the range from 300KHz to 1.5MHz can be set using the advanced option "User Sync Frequency" as shown in image 2 below.
Image 2
-Also, how can I save my custom design in webench and recall it when I need to re-run the simulation with changes?
Could you please confirm in above point the custom design you are referring to ?
Thanks and Regards,
Umayal
Hi Ali,
First, on WEBENCH if you simulate Bode test bench for frequency analysis, WEBENCH tool simulates for default range of frequency i.e. 1Hz to 1MHz (highlighted frequency range), as infrastructure limitation user is not allowed or given access to change this frequency range. WEBENCH doesn’t have any alternative.
Second, “Redesign” button corresponds to entire design configuration and not restricted to schematic changes. Again, this is WEBENCH infrastructure limitation. You can always change the Sync Frequency to desired value, click on “Redesign” button and then alter/update individual components manually.
Third, If you want to save the changes and refer in later stage, there is no direct method to do this but alternatively you can follow below steps.
Method 1:
1. After required changes, click three dots on top right corner and click “Share Design”.
2. You will be prompted to a window where you can chose to enter your email ID and have the Design link sent to that email ID or click on “Public Link”, then click “Get Link” and then copy the link.
3. This link will open your design with latest changes made before creating the link.
4. You have to follow step 1 & step 2 every time if you want to save or keep track of your design changes.
Method 2:
1. After required changes, click “Export” on top right corner and click “Print Report” to save your design in pdf format and refer in future.
Hope all your concerns are addressed, feel free to reach out to us for any further queries.
Thank you
Best Regards,
Sateesh A G
got it. thanks.
I thought last one was going to be my last question, but I noticed that when I change the "User Sync Frequency", the bode plot does not follow the Sync Frequency. When I first started, the bode plot plotted from 1Hz to 1MHz. I tried to make it to plot from 1Hz to 1.5MHz, the 1.5MHz is the max limit given for this device, LM21215A. but it got plotted up to 0.5MHz. after this no matter what I did, the plots get done up to 0.5MHz. see the spreadsheet output of the plot. I have highlighted the las frequency. what am I doing wrong with setting the frequency span for the plot?
