Selecting An Inductor Value For A DC-DC Boost Converter

by Brian Curbo, ON Semiconductor, Phoenix, Ariz., How2Power Today, Jul 16 2018

Focus:
The boost topology is fundamental in the field of power electronics, but selection of the inductor value is not always as straightforward as often assumed. In the dc-dc boost converter, the chosen inductor value has an impact on input current ripple, output capacitor size and transient response. Choosing the value correctly can help in optimizing the size and cost of the converter and ensure operation in the desired conduction mode. In this article, methods for calculating the inductor value to maintain the required ripple current and chosen conduction mode (CCM or DCM) over a range of input voltage are described. A mathematical approach for computing the upper and lower mode boundaries of input voltage is presented, a design example is presented and the use of the WebDesigner online design tool from ON Semiconductor to accelerate these design steps is discussed.

What you’ll learn:

• How to select the inductor value for a boost converter
• How to calculate the conduction mode boundaries as a function of input voltage

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