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Original question:

TINA/Spice/THS4520: THS4520 irregular circuit warning

LM5156: TINA: LM5156, Irregular Circuit Error

yee tat chua
Prodigy 60 points
Part Number: LM5156
Other Parts Discussed in Thread: PSPICE-FOR-TI

Hi,

I try to create a simulation in TINA on LM5156.

However, there are some error that unable to understand the root cause.

node number show in error message not exist on created circuit.

What is the meaning of "number" that appear on some of the nodes?

there is no connectivity issue found on node with "number"

Please advise.

TINA_Clamp_Volt.zipTINA_Lib.zip

  • 0
    TI__Genius 10385 points

    Hi Yee,

    Thank you for using E2E forums, I will look into this, please give me a day or two to get back to you.

    BR,

    Haroon

  • 0 in reply to Haroon Wardak
    TI__Mastermind 29890 points

    Hi Yee,

    Sorry for the delay.
    It looks like the error is pointing towards a note inside the IC.
    I checked the schematic, but the outside components look okay to me.

    I do not have a reference TINA model for LM5156 either, as most of our reference models switch to the newer PSpice for TI instead.
    Have you simulated this schematic in PSpice and saw the same issues as well?
    All PSpice models can be downloaded from the according product pages: https://www.ti.com/lit/zip/snvmbv9 

    Thanks and best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 60 points

    Hi Niklas,

    Yes, I did create the same circuit in PSpice for TI.

    My final target is to simulate +40V and -40V with a couple inductor using LM5156.

    Spice for TI manage to get the wanted +40V with the same circuit.

    However, having issue to get -40V with couple inductor as having error :

    ERROR(ORPSIM-15108): Subcircuit 3U used by X_U2 is undefined

    Also I log a ticket with the title "PSPICE-FOR-TI: LM5156,"

    Together with the source design file and lib.

    Maybe I need to ask a right question:

    Is there any sample design to have +/-40V with LM5156 by using couple inductor?

  • 0 in reply to yee tat chua
    TI__Genius 10385 points

    Hi Yee,

    Please give us some time to get back to you

    Thank you

    BR,

    Haroon

  • 0 in reply to Haroon Wardak
    TI__Mastermind 29890 points

    Hi Yee,

    Sorry for the delay.
    I have checked our reference design library but did not find a reference for this exact application.

    However, this design should indeed be possible with LM5156.
    To create a dual output flyback application, you can use the k_break (or k_linear) function of PSpice to couple single inductors together to a transformer.

    For design help, I would recommend our quickstart calculator tool for LM5156, which also comes for flyback applications:
    https://www.ti.com/tool/download/SNVC240

    Please let me know if you need further design help.
    Best regards,
    Niklas