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LM73606-Q1: PSPICE Simulation for inverting buck-boost

Nick Robinson
Prodigy 40 points
Part Number: LM73606-Q1


Tool/software:

Hi all,

I have been working on a design for an inverting buck boost using the LM73606-Q1. I got some nominal values for components from the datasheet and excel calculator, but the model does not seem to run. The PWM will activate for ~5 cycles and then give up. Due to ITAR restrictions, I cannot post the schematic / design file / values directly. I did find some files in the PSPICE download labeled as IBB start-up and steady state, but I cannot figure out what they might be used for in PSPICE. Is there anything in PSPICE I need to do to make use of these files? I also noticed in my PSPICE file there is a MODE=0 and FASTSS=1, but no documentation on what these are used for either in the download or in the SPICE model, and I'm afraid I don't have the experience to go through the spice model to understand them. Is there any guidance on what these do or how to set them?

Let me know if there's someone I could email to take a look at my design with the more specific implementation details.

Best,

Nick

  • 0
    TI__Guru 74475 points

    Hello

    I will assign this to our Application engineer and he will get back to you as soon as possible.

    Thanks

  • 0 in reply to Frank De Stasi
    TI__Mastermind 35210 points

    Hi Nick, 

    Please download the PSpice project link below. In the PSpice project, you can find an inverting startup and inverting steady state schematic.

    Without making any changes, make sure the schematic runs and produces the output annotated below (it is pixelated but it will be clear on your end). 

    If you encounter any errors with the changes you make, please work backwards to determine what the issue maybe.

    Startup schematic is to see the startup behavior. All nodes start at 0V. Steady state, nodes are prebiased to skipped forward past startup.

    The descriptions of the parameters are spoken about in the red text below the schematics.

    FASTSS speeds up the soft start and MODE changes the MODE of the device (Auto or FPWM).

    https://www.ti.com/lit/zip/snvmbe5