SLVUBT1A October   2019  – June 2020 TPS50601A-SP

 

  1.   TPS50601A-SP Worst Case Analysis Unencrypted PSpice Average Model User's Guide
    1.     Trademarks
    2. 1 TPS50601A-SP WCA Model Specification
    3. 2 Default Parameters
    4. 3 Example of using model with Cadence Pspice (17.2.0)
      1. 3.1 Creating a part from the netlist file
      2. 3.2 Steps to create project in Capture
      3. 3.3 Creating the schematic in Capture
    5. 4 Simulating the Model
      1. 4.1 Monte Carlo Analysis of Output Voltage
      2. 4.2 Frequency Response Analysis
        1. 4.2.1 Analyzing Frequency Response with Bode Plot
        2. 4.2.2 Analyzing Frequency Response with Histogram
  2.   Revision History

1 TPS50601A-SP WCA Model Specification

The netlist file (TPS50601A-SP_AVG.LIB) contains the average model of the device TPS50601A-SP. The model incorporates the following parameters:

  • Frequency response (Phase Margin, Phase Margin Crossover and Gain Margin)
  • Reference voltage

These parameters are modeled over the full military temperature range, –55°C to 125°C, as well as over the rated Total Ionizing Dose from 0 to 100 krad(Si). Monte Carlo analysis can be performed with the model to include device-to-device variation and changes in supply voltage.

Monte Carlo analysis models device variation for the following parameters:

  • TOL_GMea - This parameter is the transconductance tolerance (%) of the error amplifier.
  • TOL_GMps - This parameter is the transconductance tolerance (%) of the power stage.
  • TOL_Vref - This parameter defines the tolerance (%) of the reference voltage.

The default tolerance values are set based on design simulations. The user has flexibility to change these values.

There are two additional variables that need to be set based on the use case:

  • L - Output inductor value.
  • FS - Switching frequency of the device.

Environmental parameters like TID and operating temperature can also be adjusted.