Digi-Key – Surface-mount drum-core power inductors offer higher inductance for size (Pulse - PF0560)Jun 19 2012 - Passives [More Passives Articles]
Pulse’s PF0560 shielded drum-core inductors are now available from Digi-Key. They have an additional ferrite cylinder located around the outside of the two discs which guides the flux between the discs through the cylinder. The discrete air gap is the combination of the gaps between each end disc and the ferrite cylinder. Because the additional ferrite cylinder keeps the flux in a controlled path, shielded drum-core inductors are better for applications where the stray flux of the unshielded drum core may interfere with nearby noise-sensitive electronics or where electromagnetic interference (EMI) is a concern. The shielded drum-core inductor has a higher inductance for the same number of wire turns than the unshielded inductor due to the smaller air gap and higher permeability of the ferrite cylinder.
Typical applications that use drum-core inductors include: power modules; computer equipment such as notebook computers, hard disk drives, video graphic cards and small printers; telecom equipment such as modems, mobile phones and set-top-boxes; and consumer electronics such as game stations, digital cameras, PDAs, LCD displays and TVs, CD playersMore news from Digikey