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TINA/Spice/LM5119Q: Not able to simulate LM5119Q on Tina-TI

Karthik M1
Prodigy 70 points
Part Number: LM5119Q
Other Parts Discussed in Thread: TINA-TI, , LM5119, LM25119

Tool/software: TINA-TI or Spice Models

Hi,

I am designing a power supply using LM5119Q. I want the outputs of the two channel to be 27V, 1.6A and 38V, 4.3A. I am simulating the same using Tina-TI software. But, I am not able to set the proper analysis parameters for the simulation and the simulations would not converge. I tried using the 'Transient Convergence Solutions.PRM' parameter file. In this case, the simulation would provide the wrong results.

I have the attached the schematic for your reference. Please help me with this.

I am using Tina-TI version 9.3.200.277 SF-TIPower_Supply_Module_LM5119Q.TSC

Regards,

Karthik M

  • 0
    TI__Genius 9775 points

    Hi Karthik,

    FYI, one of our team will take a look at this.

    Herman

  • 0
    TI__Expert 3140 points

    Hi Karthik,

    I have looked into the issue you reported. This is happening due to the incompatibility of analysis parameter between PSpice & TINA-TI. The PSpice model which is present at TI website, is released with SKIPBP option checked.

    That means in PSpice, the simulator will skip the bias point (t=0) calculation. If we uncheck the SKIPBP option, simulation fails to converge bias point calculation.

    When we import the same model file in TINA-TI, it shows bias point convergence failure there as well. Also, there is no option to skip bias point calculation in TINA-TI.

    Hence, to resolve the issue we are currently trying to fix the PSpice model. We are trying to make it work with SKIPBP option unchecked. This will automatically resolve the bias point convergence failure in TINA-TI. I will let you know once I get any solution.

    For now please use LM25119 TINA-TI model present at TI website. LM25119 is very similar to LM5119. Sorry for any inconvenience.

    Thanks & Regards,

    Arpan Gupta

  • 0 in reply to Arpan Gupta
    Prodigy 70 points

    Hi,

    In my application, the input voltage is 48V. But, LM25119 does not operate at that voltage range.

    Regards,

    Karthik

  • 0 in reply to Karthik M1
    TI__Expert 3140 points

    Hi Karthik,

    The TINA-TI test bench you provided was unable to converge simulation. I have tried with modifying the test bench components and analysis parameters, but that did not help. Hence, I have translated the LM5119 PSpice model to TINA-TI for you. PFA the test bench LM5119_TRANS_STARTUP.TSC.

    The test bench is configured as per published PSpice schematic. I would request you to modify the test bench as per your application. Also, please try to use the same MOSFETS and DIODEs that I have used in the attached test bench. I observed that sometime simulation fails to converge if we change the Diodes/MOSFETs in the test bench.

    Thanks & Regards,

    Arpan Gupta