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433003036881

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433003036881 数据手册

Philips Components

Magnetic Products

SMD Common Mode Chokes

OPERATING PRINCIPLE

Interferences propagating via supply or signal lines can be suppressed by placing a high impedance in series. This can be

provided by a ferrite inductor. However, saturation by the supply current can be a problem. Remedies are a low

permeability material or a gapped / open magnetic circuit. The disadvantage is the large number of turns required to

achieve the required inductance, leading to high copper losses. With standard suppression methods in a signal path, the

wanted signal is often suppressed along with the interference, and in many modern applications (EDP for instance) this

leads to unacceptable loss of signal. This can be overcome with

, based on the fact that supply or

current compensation

signal currents in both lines are opposite and have equal magnitude.

In Philips’ new interference-suppression beads, a pair of conductors within a single soft-ferrite block are connected along

their lengths by an air gap. Common-mode signals - interference signals passing in the same direction along the input and

output channels of a device (a IC for instance) - serve to reinforce the magnetic flux around both conductor, and are

therefore attenuated. In contrast, the wanted signal passing along the input and output channels serves to cancel the flux

around the conductors and therefore passes unattenuated.

These common mode chokes are available in 2 sizes in

material with 2 different winding configurations.

4S2

In combination with appropriate tracks on the PCB the products can also serve as

MULTI-TURN CHOKE

TRANSFORMER

The main application areas for the SMD common mode choke can be found in e.g.

Electronic data processing

Telecommunication

Consumer electronics

Domestic appliances

November 1994

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