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TPS7H4011-SP: Issue simulating inverting configuration of TPS7H4011-SP in PSpice (5 V to negative output)

Mattia Crippa
Prodigy 30 points

Part Number: TPS7H4011-SP

I am trying to simulate the inverting buck-boost configuration of the TPS7H4011-SP using the official PSpice model provided by Texas Instruments.

My goal is to generate a negative output voltage starting from a +5 V input (for example −3.3 V or −1.5 V).

I implemented the circuit following the inverting configuration shown in the TPS7H4011-SP datasheet, but the simulation does not work as expected.

Observed behavior in PSpice:

  • The SW node does not switch.

  • The output voltage stays around −200 mV instead of regulating to the target negative voltage.

  • The controller appears not to start switching at all.

What I already checked:

  • EN pin is enabled.

  • ILIM resistor is correctly defined.

  • Inductor and output capacitor values follow the datasheet recommendations.

  • Feedback divider is calculated for the desired negative output voltage.

However, the converter never starts switching in simulation.

My questions are:

  1. Are there any special pin connections required in the inverting configuration when using the PSpice model (for example COMP, RSC, REFCAP, or FAULT)?

  2. Is there a known limitation of the TPS7H4011-SP PSpice model when simulating the inverting topology?

  3. Could someone provide a working example schematic for the inverting configuration using this device?

Any guidance or example project would be greatly appreciated.

  • 0
    TI__Genius 9091 points

    Hi Mattia,

    There is a known limitation with the current revision of the TPS7H4011-SP PSPICE model that does not allow it to be used to simulate IBB topology.

    An update to the model is in development to add the capability of simulating IBB implementations.
    If you would like, I can reach out to you at the email address in your E2E account, and send over the current version of the updated model.

    Thanks,
    Andy 

  • 0
    Prodigy 30 points

    Hi Andy,

    Thank you for the clarification and for letting me know about the limitation of the current TPS7H4011-SP PSPICE model.

    Yes, that would be very helpful. Please feel free to send me the updated version of the model that supports the IBB topology simulation to the email address associated with my E2E account.

    Thank you again for your support.

    Best regards,
    Mattia

  • +1 in reply to Mattia Crippa
    TI__Genius 9091 points

    Hi Mattia,

    I've reached out to you via email.

    Closing this thread.

    Thanks,
    Andy