TINA/Spice/TPS54526: TINA-TI Warning "Operating point not found"

RossHolt

Part Number: TPS54526
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

I am trying to use TI TINA to model a buck converter (TPS54526), which I obtained from exporting the WeBench file. However, I am not getting any desirable results, despite my ERC giving me no errors.

Ideally, I would like to see both the transient and steady state behavior of this circuit but at the moment I just want to see anything/something. I followed the circuit layout from the spec sheet.

When I do DC analysis -> Table of Nodal Volatages I get an error of: Operating point not found: Component: U1 .G_U6_G2

WHen I do Analysis -> Transient Analysis -> and cycling through all the three options (Zero initial values, use initial conditions, and calculate operating point), I see nothing on the plots

I was trying to do steady state analysis but my computer's fan started to get too fast, so I stopped just in case.

Do you have any recommendations on how I can proceed?

over 7 years ago

0 Nikhil Gupta (Product Folder Models) over 7 years ago

TI__Mastermind 39210 points

Hi Marilyn,

Please attach your TSC file so we can look at it and debug your issue.

0 RossHolt over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

Prodigy 30 points

Hi,

I'm inputting 12V and expecting 5V output, but I am not seeing thatUSBmodule.TSC

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to RossHolt

TI__Mastermind 39210 points

Hi Ross,

There are a couple of things I would like to point out.

(1) The simulation that you downloaded from WEBENCH had customized simulation parameters set to ease convergence. In your case, it looks like you made your schematic on a new TSC file (which reverted back to using the default convergence parameters). Please try to use the same TSC file as the one exported by WEBENCH and make your circuit changes there. Alternately, if you want to use a new schematic, please make sure your simulation options are same as those in the file exported by WEBENCH. You can do this by clicking on "Analysis" >> "Set Analysis Parameters ...".

(2) You are using a DC source for the input. Please add a small ramp input here instead of DC. This helps with convergence issues.

0 RossHolt over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

Prodigy 30 points

Thank you for the help, I am not longer getting that error, but now my results don't match the simulation results in WeBench. Definitely a step in the right direction. Were you able to observe 5V output? I will mark the question as resolved

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to RossHolt

TI__Mastermind 39210 points

Hi Ross,

Attached is a design I exported from WEBENCH. It was designed for 11V-13V input, 5V out and 5.5A max load. You can use this as reference for your design. The easiest way to get a working design is to build it in WEBENCH and export the simulation to TINA-TI for more detailed simulations.

2626.webench_design.tsc

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TINA/Spice/TPS54526: TINA-TI Warning "Operating point not found"