The DC-DC converters are very common sub modules in many electronic
systems. It is not a simple device so, in order to simulate in a
complex electronic structure, it can be challenging to include every
single component that comprise a DC-DC converter. It could be far
more easy to consider all the DC-DC converter circuit as a single
element in the simulation, and operate that way.
That is the idea beneath the DC-DC converter model that is presented
in the document. You can access the model, and the document that presents the main features of it, in the "SPICE and Models" section.
