1.4 Power inductor selection issues

In Chapters 1.1 through 1.3, we explained how to look at the various power inductor characteristics and the differences in features due to the construction methods. However, we believe that what designers are most concerned about are not the power inductor characteristics but the performance when it is used in a DC-DC converter.

Figure 1-21 shows the efficiency measurement results for winding Metal Alloy and multilayer ferrite inductors with the same size and inductance values in a DC-DC converter. We can see in Figure 1-21 that the efficiency significantly differs by roughly 3% depending on the type of component.

However, regrettably this difference cannot be interpreted from the current specification being described. Selecting a product based on the actual performance requires a deeper understanding of power inductor characteristics and an evaluation based on the operating conditions of the DC-DC converter.

Accordingly, the next chapter will explain the operating principles of a DC-DC converter and the relationship between the performance of a DC-DC converter and the power inductor specification. It will also provide an example of how to evaluate the actual performance of a power inductor in a DC-DC converter using the Murata DC-DC Converter Design Support Tool.

Power Inductor Basic Course
Figure 1-21 Winding Metal Alloy and multilayer ferrite efficiency measurement results

Contents:Chapter 1: What is a Power Inductor?
  1.1 Overview of power inductors
1.2 Basic characteristics of power inductors

1.3 Types of power inductors
1.4 Power inductor selection issues