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TINA/Spice/LMR14050-Q1: LMR14050 Orcad pspice convergence problem

KUO DONG
Prodigy 90 points
Part Number: LMR14050-Q1
Other Parts Discussed in Thread: TINA-TI, LMR14050

Tool/software: TINA-TI or Spice Models

I tried to run simulation in orcad pspice 16.6 using the LMR14050 TR Model ,

because of the convergence I try to 

(1) Increase Vntol to 10u

(2) in addition try increasing ITL4 to 1500

(3) in addition try increasing Reltol to 2m 

but convergence still cannot solve.

I upload the simulation file, please help to solve it.

ThanksLMR14050.rar

  • 0
    TI__Expert 3140 points

    Hello,

    I made some changes in test bench and analysis parameters to make it work. PFA the updated project files LMR14050_TRANS.zip.

    Below is the simulation result.

    Thanks & Regards,

    Arpan Gupta

  • 0 in reply to Arpan Gupta
    Prodigy 90 points

    Dear Arpan Gupta,

    Thank you so much for your kind reply. Two more questions,

    1. What dose the value X mean in the component CESR? The X must be set as 1?
    2. Is it possible to receive the LMR14050 average model under NDA through TI's local branch?(didn't find it at homepage) We want to test the phase margin performance.

  • 0 in reply to KUO DONG
    TI__Intellectual 1595 points
    Hi ,

    1. X means multiplier. For capacitance = 22uF and X= 2 refers to the equivalent capacitance of 44uF.

    2. We do not have average model of LMR14050 but you can observe phase margin performance through WEBENCH simulation.
    Else, you can look for average model of similar devices from all the available SPICE models through below link.

    Thanks,
    Vivek Agarwal