There are several source of example circuits for LTspice XVII. There is the directory
that gives numbers non-commercial examples of SPICE simulations that illustrate different analysis types, methods or program features.
In the directory
there is an example simulation for every Linear Technology device with a macromodel in LTspice XVII. Note that these jig circuits are often only test jigs for the macromodel, not necessarily recommended reference designs. You will need to audit the value of the capacitors used in the SMPS circuits. Your local Linear Technology office should be able to give you design support specific for your application needs.
Notice that LTspice XVII includes handlers to give a preview of the schematics in Windows Explorer and file utilities.