DC-DC buck converter

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Joined Oct 10, 2011
A dc-dc buck converter has the following parameters: f= 20kHz, ton= 20μs, L=400μH, Vs=20V and R= 20Ω

  1. Calculate the average value of the output voltage and current
  2. Calculate the minimum value of the inductor necessary for the buck converter to operate properly
  3. For given value of L, calculate the value of the capacitance for ΔV of 37.5mV
  4. Calculate the the max and min values of the inductor current
Can you please help me with the above