What is the difference between *.APP and *.ASC files?
An APP file is a schematic file and has embedded control statements to help calculate efficiency and other product information. ASC file is the general schematic file without any hidden SPICE commands. ASC file is the more general and powerful file format. It is recommended that you save your own designs with a .ASC file name extension.
How can I get an efficiency report for my schematic?
You need to add a ".TRAN <time> steady" statement on the schematic. The program will automatically detect the steady state by checking the internal state of the LTC macro-models. It doesn't work when LTC switching regulator part is absent. There must be exactly one Voltage source in the circuit. This will be identified as the input. There must be exactly one current source in the circuit. This will be identified as the load. After the simulation is done, you can select the 'Efficiency Report' under the 'View' menu to see the report on the schematic.