Low profile wire-wound inductors offer highest current rating for component size

1 November 2006 Passive Components

Taiyo Yuden's NR6012 series of low-profile (1,2 mm height) 6 x 6 mm power inductors for DC-DC converter choke coil applications are in the LCD panels of notebook PCs. The 11 models in the NR6012 series offer a broad selection of low DC resistance (0,092-2,18 Ω) and high inductance ratings (3-100 μH), as well as what the company says is the industry's highest current rating (1730 mA) for the 6 x 6 mm device form factor.

In notebook PC applications, LCD power circuits require DC-DC converters with high current handling capability and a stable DC voltage supply. Posing a design challenge, the demand for lower-profile mobile equipment is driving a corresponding need for choke coils - the main component in DC-DC converters - with higher current capacity and a lower physical profile. However, boosting current capability necessitates increasing the size of the core and thickening the lead wire inside the inductor, both of which make reducing the size and profile of the device very difficult.

Taiyo Yuden responded to this design challenge by departing from the conventional round drum/sleeve core technology used in typical inductor designs. The company instead developed a unique sleeveless square-core winding that eliminates all wasted space and thickens the lead wire inside the inductor to achieve the lowest possible DC resistance. Moreover, the NR6012 series' special ferrite-based resin covering further reduces component size and enables the industry's highest available current rating of 1 A at 10 μH inductance.

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