Explain Buck regulator operation?
When the switch in the buck regulator is on, the voltage that appears across the inductor is Vin - Vout. Using the inductor equations, the current in the inductor will rise at a rate of (Vin-Vout)/L. At this time the diode D is reverse biased and does not conduct.
When the switch opens, current must still flow as the inductor works to keep the same current flowing. As a result current still flows through the inductor and into the load. The diode, D then forms the return path with a current Idiode equal to Iout flowing through it.
With the switch open, the polarity of the voltage across the inductor has reversed and therefore the current through the inductor decreases with a slope equal to -Vout/L. It is also worth noting that the average input current is less than the average output current.
How to Calculate Critical value of capacitor for Buck regulator?
Critical value of capacitor for Buck regulator calculator uses Critical capacitor value = (1-Duty Cycle)/(16*Inductance*Natural Frequency^2) to calculate the Critical capacitor value, The Critical value of capacitor for Buck regulator formula is defined as the minimum value of capacitance in order to have a continuous current in the inductor and, therefore, maintain good regulation. Critical capacitor value is denoted by C_{c} symbol.
How to calculate Critical value of capacitor for Buck regulator using this online calculator? To use this online calculator for Critical value of capacitor for Buck regulator, enter Duty Cycle (D), Inductance (L) & Natural Frequency (ω_{n}) and hit the calculate button. Here is how the Critical value of capacitor for Buck regulator calculation can be explained with given input values -> 9.183673 = (1-0.1)/(16*5*35^2).