UCC28C54: Spice model not working in Ltspice - Issue with RT/CT pin

Part Number: UCC28C54

Tool/software:

Hello,

I made a simple test circuit for UCC28C54 using spice model on the product page, the simulation freezes when Vdd reaches about 6V. However, if I provide a sawtooth on RT/CT pin, simulation works as expected.

Has anyone seen this issue?

Thanks.