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adjustable boost converter with LTC3786

hello

is it possible to design an adjustable boost converter with LTC3786, I mean a converter which be able to produce voltages from 5v to 18v and current 0-5A from an 4.5v input voltage ? 

if yes why when I design in LTpowerCAD by reducing output voltage and current the inductor and sense resistor values which were ok for maximum voltage and current output, get out of range ? what is the solution ?

thank you.