From this, we can see that the value of ripple current is dependent on the value of the inductance.įor a buck converter, choosing the correct value of inductance is important to obtain acceptable inductor and output capacitor sizes and sufficiently low output voltage ripple.Īs you can see from Fig. Where V l is the voltage across the inductor, di is the ripple current, and dt is the duration for which the voltage is applied. The amount by which the current in the inductor changes during a switching cycle is known as the ripple current and is defined by the following equation: Where L is the inductance in Henrys and I is the peak value of inductor current. The amount of energy stored is given by Energy = ½L.I 2 (Joules) When the switch turns off, this energy releases into the load. When the semiconductor switch is on, the current in the inductor ramps up and energy is stored. In all switching regulators, the inductor is used as an energy storage device. For the PDF version of this article, click here.
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