How to compare and select inductor types

As a key device of power adapter, energy storage inductor plays an important role in the performance of power supply, and it is also the object of product design engineers' focus and debugging. Next, EAHUNT will compare and contrast large inductors and small inductors, wirewound inductors and laminated inductors, magnetically shielded inductors and unshielded inductors.

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Large inductors and small inductors of the same size

The term "same size" means that the physical shape of the inductor is approximately the same, while the term "size" refers to the difference in capacity. Generally speaking, inductors with smaller capacity have the following advantages:

Lower DCR, higher efficiency and less heat generation during heavy loads;

Having a larger saturation current;

Having a faster load transient response;

And high-capacity inductors have lower ripple current and ripple voltage, lower AC and conduction losses, and higher efficiency at light loads.

Wirewound Inductors and Stacked Inductors in Power Adapters

Compared to wirewound inductors, laminated inductors have the following advantages:

Have a smaller physical size, taking up less PCB area and height space;

Having a lower DCR for higher efficiency at heavy loads;

Having lower AC losses and higher efficiency at light loads.

However, the SATI of the stacked inductor is also smaller, so it will have a larger ripple current at heavy loads, resulting in a corresponding increase in the output ripple voltage.

4 Magnetic Shielded Inductors and Unshielded Inductors

Unshielded inductors will have a lower price and smaller size, but also produces EMI, magnetic shielding inductors will effectively shield out EMI, so more suitable for wireless devices such as EMI-sensitive applications, in addition it also has a lower DCR.

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