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According to TI support, there are no SPICE models provided for UC184x series. Guess you already found the statement if you know how to use Google. Ltspice Yahoo group has behavioral models as Ltspice schematics. The could be translated to subcircuits if you need it for other simulators.
Might look for UC3845 models; the 1845 is just a
temp range binned grade of the same design.
LTSpice behavioral models can be "opaque" and use
built-in functions of LTSpice that other simulators may
not support.
TI web page has a large set of downloadable models
and UC3845 is there (although comments indicate the
model is for "UCCx8C45 Unencrypted PSPICE transient
model".
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