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UC1843A: LTspice simulation error

Part Number: UC1843A

I'm getting the dreaded "time step too small" error while trying to simulate a flyback controller using the UC1843A-SP model downloaded from the product page. The same circuit, but using the built-in LT1243 controller, is working with no problems. I can't figure out what I need to tweak to get the simulation to run using the UC1843A.