☑ Ripple Current Of An Inductor

To get a good compromise between inductor and capacitor size you should choose a ripple current value of 10 to 30 of maximum load current. In this design note a theoretical derivation of ripple current to average current ratio also called ripple factor is introduced to get inductor size equation.

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Ripple is what you see because when the mosfet is on the current increases when the mosfet is off the current decreases.

Ripple current of an inductor. The current in the inductor will be continuous for output currents greater that 5 15 of full load. To achieve a good compromise between inductor and capacitor size a ripple current value of 10 30 of maximum inductor current should be chosen. This also implies that the current in the inductor will be continuous for output currents greater that 5 to 15 of full load.

The inductor ripple current cannot be calculated with equation 1 because the inductor is not known. A good estimation for the inductor ripple current is 20 to 40 of the output current. If you increase the frequency the ripple current will be smaller.

As a rule of thumb current ripple of inductor is always designed to be around 30 of average inductor current. If you increase l1 inductance the ripple current will be smaller. By applying area product ap method of inductor design.

For decades power supply designers have set their inductor ripple current to somewhere between 20 and 40 of their power supplys full rated output current.

Simulated Peak To Peak Inductor Current Ripple I Of 3