Dostal's Designs: Selecting the Right Inductor Current Ripple (Download)

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A switching regulator converts an input voltage to a higher or lower output voltage. For this, an inductor is used to store energy temporarily. The size of this inductor depends on the switching frequency of the switching regulator as well as the expected current flow through the circuit. How exactly is the correct inductance value selected? It can be done using a commonly used formula that contains the inductor current ripple.