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TINA/Spice/LM43603: Pin name in PSpice Model

takishin
Expert 2360 points
Part Number: LM43603
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Our customer has some questions about LM43603.
I'm posting the questions for the customer:

++++++++++++++++++++++++++++++++++++++++++++++
We have found the difference of some pin names between the LM43603 data sheet and the PSpice Model.

LM43603 Non-Inverting and Inverting PSpice Transient Model;
Lines 52-53 in \LM43603_PSPICE_TRANS\LM43603_TRANS.LIB (snvm717a.zip)

(line52) .SUBCKT LM43603_TRANS BIAS CBOOT "DAP" ENABLE FB PGND_1 PGND_2 PGOOD RT SS_TRK
(line53) + SW_1 SW_2 "SW_3" SYNC VCC VIN_1 VIN_2 PARAMS: MODE=0

The pin names of "DAP" and "SW_3" are not described in "Pin Configuration and Functions" of the LM43603 data sheet.
And the pin names of "AGND" and "PAD" in "Pin Configuration and Functions" are not included in above .SUBCKT data.

Is the model correct?
Is that the issue for PSpice simulation?

++++++++++++++++++++++++++++++++++++++++++++++

Thank you in advance.

Best regards,
Takishin

  • 0
    Expert 2360 points
    Hi,

    Is there anyone who knows about that?

    Thanks,
    Takishin
  • 0 in reply to takishin
    TI__Intellectual 2405 points

    Hi Takishin,

    I went through the model and it seems that SW_3 pin is connected to SW_2 pin through 1mohm resistor (as good as shorted) and DAP pin is connected to PGND_1 through 1mohm resistor (so again shorted with external GND). Ideally, DAP should have been PAD and PGND_1 as AGND. Also PGND_1 and PGND_2 are shorted through 1mohm resistor internally. There might be some reason why the model development engineer used this convention, but I am not aware of it.

    So, just to reiterate, there is nothing wrong with model except for some naming conventions, and you can recommend customer to use this model for their simulation assuming above pin names.

    Thanks!!

    Best Regards,

    Mahavir Jain.

     

  • 0 in reply to Mahavir Jain
    Expert 2360 points
    Hello Mahavir,

    Thank you for your reply and clear explanation.
    I will report it to the customer.

    Best regards,
    Takishin