TINA/Spice/TPS54331: Bode plot GM & PM issue during AC simulation

Brian,

In Spice, you usually can not use a transient model to get the loop response of switching circuits. You will need an average model for this. You can read more details here: e2e.ti.com/.../3123.differences-between-a-transient-and-an-average-model

Dear Nikhil:
Thanks for your reminder! But I cannot find a TPS54331 AVG model in your design support or in TINA library set.
Can you provide it?

Thank you!
Brian

Brian,

Have you tried using WEBENCH tool to create a design for this device. It has the Bode plot simulation built into it.

What is the timeframe for when you need this standalone TINA-TI model? I can add it to the queue, but there are several models ahead of this on the development queue.

Dear Nikhil:
1. Actually we are adding circuits outside of the regular simulation profile. WEBENCH cannot add extra circuits (OPAmps, R, C) and do the simulation.
2. Right now we are almost enter production and we are fixing the load transient large V drop issue. Need the simulation model ASAP.

Thank you!
Brian

Dear Nikhil:
Or do you have similar part model which has similar AC behavior that we can try first.

Thank you!
Brian

Hi Brian,

You can search for all available models using the link below. In the search box, use the phrase similar to "TPS54 average TINA". TPS54360 or TPS54335A could be good examples for you to look at.

Hi Brian,

TPS54331 TINA-TI average model has been added to the product folder. You can find it here. 

Regards,

Lakshmi

Dear Lakshmi:

The model seems OK to use.

Thanks for your help!

Brian