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TINA/Spice/TPS54425: About TPS54425 and TPS7A8300 transient model

Tsukui Yusuke
Guru 21930 points
Part Number: TPS54425
Other Parts Discussed in Thread: TINA-TI, TPS7A8300,

Tool/software: TINA-TI or Spice Models

Hi,

Let me talk about the TPS54425 and TPS7A8300 TINA-TI simulation.
Please refer to the attached simulation file.

54425_1.8V_and_8300_1.0V.TSC

I got two questions from customers.
・Does the TINA-TI sim work normally?
　Customers are using TPS54425 and TPS7A8300 sim files at the same time.
    Therefore, they want to check that it works properly.

・If it is operating properly,
　Inrush current was confirmed on simulation waveform.
　Customers want to know the cause of this occurrence.
　Inrush current is change the location that occurs for every simulation.


　
　

Could you give me your advice?

Best Regards,
Yusuke/Japan Disty

  • 0
    TI__Intellectual 1090 points

    Yusuke-san,

    Please find my response to both queries below:

    1. Both the devices have been tested for Vin,Iload corners of the EVM and hence should work properly.

    2. Since the device seems to be operating properly for simulation time of 3.7ms and not for 4.0ms. The problem is with the analysis parameters.

        I have modified two analysis parameters to get the testbench working without the glitch currents.

        a. TR max. iteration number was changed to 40 from 20.

        b. TR maximum timestep was reduced from 10G to 50n.

    Please find the results below after these changes:

    There still is a single glitch at the start of the simulation(around 200us). I will try to remove the same as well.

    I have also attached the .TSC file for your reference.

    Regards,

    Karthik

  • 0 in reply to Karthik Kulkarni
    TI__Intellectual 1090 points

    Yusuke-San,

    It looks like there was some issue with the updated file in the previous response.

    Please find the attached TSC file below. I was able to remove the glitch seen at the initial part as well. This was done by marking the option to 'Zero Initial values’  in Analysis--> Transient tab. Please find the image below:

    TSC file:

    54425_1.8V_and_8300_1.0V (1).TSC

    Regards,

    Karthik