Industry's first integrated ferrite-bead inductor
16 November 2005
Passive Components
Pulse has introduced the PA0766NLT Power Bead inductor which contains two independent inductors integrated into a single core structure and part number, with no magnetic coupling between them. According to the manufacturer, replacing two discrete inductors with one Power Bead inductor reduces the footprint and the PCB cost and improves circuit performance.
The PA0766NLT series can be used in any multiphase circuit application. Although typically used for double data rate (DDR) memory, multiphase CPU power, and other desktop, portable and server computing applications, it can also be used in two-and four-phase telecommunications power systems.
Replacing two surface-mount powdered iron inductors with one integrated inductor produces the following benefits claims Pulse: a 20% savings of board space; a 47% lower direct current resistance (DCR); an 80% lower core loss; reduced AC proximity loss in the winding; and, a cost reduction of 25%. The PA0766NLT's footprint is 14 x 13,5 x 7 mm.
The PA0766NLT Power Bead series is available in four different inductance values and current ratings. They range from 296 nH at 38 A peak current per phase to 568 nH at 18,5 A peak current per phase. The two independent inductors can be connected in series or parallel to form a single inductor with an inductance and current range from 150 nH at 76 A peak current to 770 nH at 25 A peak current. The DC resistance is 0,9 mΩ maximum per phase. The part is rated for operation up to 130°C and is RoHS compliant.
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