Power Inductors

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We offer leaded and surface mount devices along with low profile SMD power inductors for mobile electronics and AEC-Q200 qualified inductors for automotive uses.

An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it. Inductors can be further categorized into RF inductors used for signal processing, and power inductors for power supply lines.

Power inductors are typically used to filter EMI noise in AC inputs, filter low frequency ripple current noise and to store energy in DC-to-DC converters.

Types of power inductor

Winding Metal Alloy inductors bond the winding and resin-coated metal magnetic powder with thermocompression. They can be applied to high current areas in large-sized to small-sized products. As DC-DC converters have shifted toward high-speed switching in recent years, and low inductance is required, winding metal alloy inductors are becoming increasingly important.

Winding Ferrite: Because the magnetic permeability of ferrite material is high, there are advantages to selecting winding ferrite for use in high inductance applications. The wide-ranging target markets include smartphones, TVs, and HDDs.

Multilayer ferrite is an inductor which alternately laminates and sinters the magnetic material and inner electrodes. Compared to the winding structure, it enables compact and low-profile form factors with high inductance and high voltage capabilities.

How to select a power inductor

The primary factors for comparing power inductor performance are:
  1. Inductance value
  2. DC superposition characteristic
  3. Temperature characteristic
  4. Voltage endurance
  5. Leakage flux
Knowing these factors will enable you to select the power inductor structure which is suited to the required level of performance.

A power inductor with a good DC superposition characteristic is one whose inductance does not decrease at high currents such as those demanded by digital circuits. If inductance does not decrease, the ripple currents are kept constant, and stable circuit operation can be maintained.

Power inductor applications

As electronic devices become more advanced, the power supply voltage of LSIs used in them is lowered, so their power consumption can be reduced, and their speed increased. However, a decrease in the power supply voltage also causes the requirements regarding voltage fluctuations to become more severe, creating a need for high-performance DC-DC converters to fulfil these characteristic requirements; power inductors are important components that greatly affect the converters’ performance.