TPS543A22: Netlisting errors when attempting to recreate Webench circuit

Can you share the details of the changes that were made to the test bench?

Sure thing. I removed C12, C13, R13, C15, C16, and R4, then changed R5 to 8.06k, L1 to 900nH, C11 to 4.7u, C8 to 4.7p, R7 to 90.9k, R8 to 10k. I essentially tried to match what I got from the design attached. Maybe there is a more simple way to translate these designs into PSpice for TI?

I also know previous times I attempted to run the simulation I had convergence errors occurring, though that could be for another question to ask.

 WBDesign3.pdf

Can you share the pspice file or image of your test bench? 

 I made the above changes on my pspice test bench and it is running for me. 

TPS543A22_TRANS.DSN

I was able to run it too, but then noticed some instability on the circuit and tried recreating. I am now getting the same netlisting error--I only changed the input capacitors to match the design, adding parameters for their respective ESR.

The TPS543A22 is the 12A version of the device.  The default testbench has the R15 as 1/12 which is full load of 12A for 1V output voltage.

When regulating to 5V with that 1/12 resistor, the load current will be 60A.   So, I think you may be experiencing current limit.    Change R15 to 5/12 see if issue is resolved.      

Thank you, that helped and I was able to run the job, but it hangs around 5/6% with converging errors. I've tried following guidelines in a previous question by easing some of the tolerances--still run into converging issues. When I try to use the Autoconverge option the simulation terminates. 

I updated the models and got the simulation to work. I believe prior to this I had the model from before 7/8. Thanks for your help, but now I'm a bit concerned with the simulation...I am trying to get my design to work for a switching frequency of 1.5 MHz and have selected the 8.06k resistor according to the datasheet but am concerned the regulator is switching faster. I've tried a screengrab of the V(SW).

Furthermore the simulation is taking longer than expected during a transient sweep to see the output voltage come to my preferred design value of 5V. I've increased the speed level and maximum step size but data seems to be on the order of around 2 hours to record only 1.3ms at which it does not reach 4V. Do you have any suggestions/tutorials to follow to get a sweep much quicker? Thank you.

What are you measuring for frequency, I am measuring 1.4MHz from rising edge to rising edge ~0.7us in the image. 

MSEL is 11.3kohm which yields a 2ms soft start time, 1ms soft start time can be selected by changing the MSEL resistor.    

On the bottom of TPS543B22 product folder, webench is enabled to run pspice for load transient and steady

state by clicking simulation and selecting which simulation.   

The simulations on webench are faster because initial conditions are used and the start up sequence is bypassed. 

The TPS543B22 is same as A22 but with a higher current limit trim.  

Here is a FAQ on balancing speed vs accuracy which you may have tried some of these already.

(+) [FAQ] PSPICE-FOR-TI: My simulation fails to converge and says "INFO(ORPSIM-16594): To improve Pseudotransient Convergence and Performance, set following options: PTRANABSTOL=1e-5, PTRANVNTOL=1e-4"? - Simulation, hardware & system design tools forum - Simulation, hardware & system design tools - TI E2E support forums

That makes sense, I accidentally measured only the pulsed voltage. I see it now that it switches around 1.4 MHz.

I've changed MSEL to 9.09k to get the 1ms soft start time.

I've went through the FAQ and a similar presentation on improving convergence issues and noticed the simulation still takes the same amount of time to complete. Typically around 0.7ms the simulation seems to take longer. I've even left it running overnight and only reached up to 2ms in the transient.

Ultimately, I am looking to verify the input and output ripple of the regulator. My company has done an analysis on a different TPS part using LTspice. I would prefer to use that analysis to save time but this part is encrypted. Is it possible to receive an unencrypted model of the TPS543A22 regulator to recreate in LTspice instead? 

Yes, unencrypted models are available with an NDA.   I need to work with the TIer assigned to your account.  Do know the TI account manager? 

I do not, however I'll send you a private message to continue this conversation, thanks again for your help. I believe the original issue was resolved earlier so I will close this question out.