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Question

How should I select an inductor for a DC/DC converter?

Answer

DC/DC Switching RegulatorsHow to use

Each IC is designed for some specific inductance value shown in each datasheet. Use an inductor whose inductance is within the recommended range. Switching current is not flat. Select an inductor whose rated current is higher than the peak current of the switching.

The calculation method of the maximum output current flowing to the inductor is explained in datasheets of each product.

There are two types of rated current for inductors: One is the DC current based on decreasing inductance value by 30%, and the other is based on temperature-rise by 40%. Consider the smaller value of the two ratings as the rated current.

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