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Wire-wound inductors load 3A at 10?H rating

Posted: 15 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power inductors? DC/DC converters? choke coils?

Taiyo Yuden Inc. has unveiled the NR6045T series of wire-wound power inductors for DC/DC converter choke coil applications in LCD/plasma TVs and other flat panel displays (FPDs).

Measuring 6mm x 6mm x 4.5mm height (max), the 14 models in the NR6045T series offer an excellent selection of low DC resistance (0.014-0.5), high inductance (1-100?H) and high current ratings (0.8-8.5A). The NR6045T-100M device, for example, offers the industry's highest rated current (3A at 10?H) in the 6mm x 6mm form factor. With the equivalent performance of larger 7-10mm square devices, the 26 percent to 64 percent smaller footprint, respectively, of NR6045T series devices facilitates more compact DC/DC converters and thinner-profile product designs.

Due to the aggressive price/performance quest of the expanding global FPD market, greatly increased numbers of IC chips are now required for the I/O, image processing and information processing circuits of flat panel displays. Power supply circuits are likewise increasingly used for each IC chip to more efficiently use power and lower overall consumption as much as possible. These circuits, however, require costly multilayer boards that have grown in size due to the increase in the number of power supply circuits, a factor that has also driven up FPD prices.

This has resulted in a corresponding demand for choke coilsthe main component in DC/DC converterswith higher current capacity, lower DC resistance (RDC) and smaller physical size. Boosting current capability, however, requires increasing the size of the core and thickening the windings inside the inductor, both of which make reducing the device's size very difficult.

Taiyo Yuden responded to this design challenge by improving the round drum/sleeve core technology used by conventional inductor designs. A unique sleeveless, square-core winding was developed for use by the NR series inductors that successfully eliminated all wasted space and thickened the lead wire inside the inductor to achieve the lowest possible DC resistance.

Sampling price starts at 30 cents each. The devices are available now in volume production quantities. Delivery is 2 weeks ARO.

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