By varying the duty cycle of the mosfet we can increase the input voltage by a factor of 1/(1-D) (where D is the duty cycle).
In the example we have set the duty cycle at 50% so with 10V at the input we expect that after the transients settle out to have 20V at the output. The efficiency of the converter in the example is 96%.
If you want to change the duty cycle just change the
width of all voltage pulse sources (5% is 50% duty cycle and 10% is 100% duty cycle).
