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TPS61232: TPS61232 PSpice Model Won’t Reach 5 V — Output Stalls at ~3.2 V

Armando Isaac Parra Cruz
Prodigy 10 points
Other Parts Discussed in Thread: TPS61232, TPS61230

Hello TI Support Team,

I’m evaluating the TPS61232 boost converter using the official PSpice macromodel package.

  1. Download & Setup
    • I downloaded the complete “TPS61232_STARTUP-trans” example project from the TI TPS61232 Unencrypted PSpice Transient Model Package (Rev. B).
    • I opened the provided schematic in PSpice for TI (Version 2024).
    • I made no modifications to the component values, netlist, or pin wiring—everything is exactly as shipped.

  2. Simulation Conditions
    • Input voltage (VIN): 3.3 V
    • Inductor: 1 µH
    • CIN: 22 µF, COUT: 30 µF
    • RLOAD: 2.5 Ω (i.e. 2 A load at 5 V)
    • EN tied directly to VIN
    • Soft‑start cap: 10 nF on SS, bootstrap cap: 100 nF on HYS/VS
    • Transient run for 1.15 ms with 20 ns max time‑step

  3. Observed Behavior
    Instead of ramping up to 5 V, the output settles at about 3.2 V, and never transitions into the expected regulated mode.

Could you please help me understand:

  • Is there a known limitation or special setting required when using the TPS61232 PSpice macromodel in PSpice for TI?

  • How can I get 5V in the output?

Thank you for your time and assistance.

Best regards,

Armando Isaac Parra Cruz.

  • 0
    TI__Mastermind 19030 points

    Hi Armando,

    I think the model might be directly copied from the TPS61230 and can't support the simulation for the fixed 5V Vout configuration.

    To use this model for simulation, you may regard it as the TPS61230. That mean, a feedback resistor divider should be used for 5V Vout, just as shown below.

    Don't worry for the actually TPS61232. It can correctly generate 5V Vout when the FB is connected to the Vout.

    Regards

    Lei