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issue: July 2004 APPLIANCE Magazine

Electronics Report
Metalized Drum Core Power Inductors

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The small footprint of the new Coiltronics(R) LD Series metalized drum core power inductors from Boynton Beach, FL, U.S.-based Cooper Electronic Technologies (CET) are said to be ideal in applications where board space is restricted or critical.

The series is said to offer engineers a new design option both from a mechanical and electrical point of view. “Parts will fit into smaller PCB spaces and are typically more efficient than parts termination with metal clips,” Elvis Perez, an engineer and senior product manager for CET and Cooper Bussman, a division of CET, tells APPLIANCE.

The metalized drum core inductors are used in power supply and EMI/noise filter applications with specific applications for d.c./d.c converters and control boards found in appliances such as cellular phones, PDAs, and computers.

Used for buck, boost, noise filter, and output filter applications, the power inductors reportedly use minimum board space because terminations are on the bottom of the drum core surface. “Most inductors utilize a wound core plated on a plastic header (mount) assembly,” Elvis Perez, an engineer and senior product manager for CET and Cooper Bussman, a division of CET, tells APPLIANCE. “Coiltronics has eliminated the plastic header by placing connections on the core itself. This technique results in lower-resistance connections and a smaller footprint on the board.”

The smaller footprint results in less restriction on board space, he explains. Ultimately, this helps electronic equipment manufacturers reduce costs because they are able to use smaller and less-expensive printed wiring board, Mr. Perez says. “A smaller board can be placed in many locations where a larger board may not fit. The reduced footprint of the LD1/LD2 occupies minimum board space,” he notes.

The LD Series surface-mount power inductors are available in two sizes. The LD1 is 4.5 by 4.0 by 3.2 mm, and the LD2 is 7.8 by 7.0 by 5.0 mm. LD1 inductance ranges from 1.0 to 68 uH, and the current ranges from 0.52 to 4.26 A at peak current. LD2 inductance ranges from 10 to 470 uH, and its current ranges from 0.45 to 3.45 A peak current.

Another feature that sets the new series apart from the competitive products is self-termination, Mr. Perez says. “Self-termination offers several advantages over similar unshielded inductors on the market,” he explains. “Typically, [it provides] better mechanical performance and lower copper loss because direct-current resistance (DCR) is lower.”


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