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TPS63020: TPS63020 Spice Model

SSC
Prodigy 95 points
Part Number: TPS63020
Other Parts Discussed in Thread: PMP9759

Hello,

I am using the Pspice model for the TPS63020 and configuring it to drive a TEC (simply modeled as a 2 Ohm resistor).  I am making connections as shown in the app note, PMP9759.  The spice model does not seem to work in this configuration.  If, instead, I connect the resistor/TEC to GND instead of to the input pin, the simulation seems to work.  Can you advise how I can get this model to work as a TEC controller as shown in the app note?  I am assuming there may be some discontinuity when the output voltage reaches close to the input voltage and then the simulation does not close (i.e. Output does not regulate and the FB pin goes away from the nominal 0.5V).

SSC