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TINA/Spice/TPS55165-Q1: Model/simulation ISSUE

Sainath d
Prodigy 165 points
Part Number: TPS55165-Q1
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

I am trying to simulate TPS55165-Q1 in fixed 12V output in pspice, when I try to connect BST1/BST2 to cap as recommended in the datasheet, I get an error saying the pin is floating , I have tried running in multiple machines but the issue remains same, Please see the screenshot below,

 

 

SETUP:

Error:

N03722 is the node name for the wire connected to BST1, N03726 is for BST2.

 

 

 

When I try to connect it without cap, it works fine till 3ms and output travel back in time at 12V constant. i.e., out is 12V like I want but in time 3ms-0ms,which shouldn’t be possible.  I have attached project files fyr.

 

 

TPS55165-Q1_sim.zipslvmca3a.zip

  • 0
    TI__Genius 9775 points
    One of our team member will look into this, but it will be after new year's holiday.

    Happy New Year!
  • 0
    TI__Intellectual 835 points
    Hi Sainath,

    Please find my respone below.
    1. It looks like there is some issue with the project shared by you named as "TPS55165-Q1_sim.zip". PSpice (16.2 and 17.2) crashes when I try to open it. Please confirm the version you are using.
    2. BST1 and BST2 pins are not modeled. Device works properly without using capacitor at those pins. This information is mentioned in "Application notes" section in release project. These pins are supposed to be kept floating.
    3. There is a ~10ms IGN deglitch time implemented in the model. Startup time is around 1.5ms (as per datasheet). Please use the TSTOP value higher that 12ms to observe complete startup.

    Kindly let me know if you still have any query.

    Thanks,
    Abhisek
  • 0 in reply to Abhishek Tripathy
    Prodigy 165 points

    Hello Abhishek,

                            I appreciate you response. I have used SPB 16.6 ( cadence 16.6) to draw the circuit, I tried simulating without using caps at those pins, I would get 12V at 1.2ms but from there I observe output in reverse direction.

    I have attached the waveform fyr.

    I have used the same file to simulate the below response

    Circuit:

    Waveform:

    even when I connect BST1 and BST2 directly I get the same response

    Regards,

    SAINATH D

  • 0 in reply to Sainath d
    TI__Intellectual 835 points
    Hi Sainath,

    It seems that there is issue with opening of the .dat file in AMS simulator. It is a common problem when the dat file is large in size. Please try restarting AMS simulator and reloading the dat fiile.

    Regards,
    Abhisek
  • 0 in reply to Abhishek Tripathy
    Prodigy 165 points
    Hi,
    I tried removing dat file and run the simulation, each time I did so! I would see the same result, but surprisingly at lower voltage, what I mean is earlier it use to run till 12V and then I use to see this response but now it happens well before that like at 5V or 3V. I ran in multiple machines I would see the same issue. Please help me on it
  • 0 in reply to Abhishek Tripathy
    Prodigy 165 points

    I have attached the cadence 16.6 files again.lm55165-Q1.zip

  • 0 in reply to Sainath d
    TI__Intellectual 835 points

    Hi Sainath,

    I simulated the project shared by you. It runs absolutely fine. Please find results below.

    I feel that there is some issue with loading the large data file in AMS simulator on your system.

    I hope this clarifies your query. 

    Thanks & Regards,

    Abhisek