This is being answerd as part of a Simscape Electrical Matlab Answers cleanup. I apologize for this being too late to be useful for you.
The simulink under the hood implements directly the equations in the help document. The biggest issue is an understanding of simulink in order to understand how this is implemented. It is like trying to read a programming language that you are not familiar with.
To get familiear enough with Simulink in order to understand this model, please start here: https://www.mathworks.com/learn/tutorials/simulink-onramp.html
This is free training.
