Various wound-type power inductor products with ferrite or soft magnetic metal core are offered.
Coil Inductor With Ferrite Core Series Inductors RealizeCompared to ferrite-base wire-wound inductors, the SPM series inductors realize larger current, lower Rdc, smaller size and superior DC bias characteristic.In addition, they ensure low magnetic flux leakage and are effective as a means to suppress acoustic noise of the coil. This article introduces the structure, features, and application of these products, and other information that helps you in an easy-to-understand way. TDK offers a large selection of the SPM series inductors, including the low-profile SPM-LR series, the SPM-HZ series for automotive applications, etc. These inductors use Fe-base alloy powder to have high saturation characteristics, i.e. The inductors of this series are offered in large selection of product sizes. The low-profile (H 1.0 to 2.0 mm) is achieved by employing the terminal of proprietary shape. A simple structure without exterior terminals is achieved by employing the wire collinear electrode structure. By using the proprietary alloy powder, low loss in the high frequency region is achieved, in addition to having high saturation characteristics. The inductors of this series are designed for automotive applications. Compared to the SPM-HZ series, this series inductors have wider operating temperature range in automotive environments. The integral mold structure and the welding method for connecting the wire and terminals achieves high reliability. Compared to ferrite cores, metallic magnetic cores have higher magnetic saturation density and better DC bias characteristic. Also, they have good shielding qualities and the magnetic flux leakage is small. One of the inductors characteristics is that they store energy by self-induction function. Chopper type DC-DC converters use inductors having such characteristics with switching devices for voltage conversion (see Figure 9). Depending on the processing method, inductors can be classified into multilayer type, thin-film type, and wire-wound type. Since wire-wound type permits large current to flow, most of the power inductors are wire-wound type.
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