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What happens if you put a load on the output? Try some different loads, e.g. 10 mA, 100 mA, 500 mA.
In no load condition, output voltage of buck converter will increase, same as the dc input voltage. Analysis:When the static switch conduct, the capacitor will be charged from dc input via inductor. When the switch in "off" condition, the energy in the inductor will passed to capacitor via diode.Since no load connected to capacitor, so the capacitor never discharge. As the result, the capacitor voltage will increase to dc input voltage.After the capacitor voltage same as the dc input voltage, no current flow in the circuit when the switch conduct or not.