Mini drum cores for power inductors

18 June 2003 Passive Components

Today's miniaturisation trends are leading to smaller, lighter, handheld devices. Both the size and the need for micro power are driving the necessity for very small power inductors. Ferroxcube's new series of mini drum cores for power inductors has been developed in the most advanced materials to meet demand for smaller, thinner and advanced-featured products. With a maximum height which can go down to 0,8 mm the new series of small drum cores will help designers to succeed in selecting magnetic cores. Main applications of the power inductors are telecom, lap tops, set-top boxes and handheld equipment.

MnZn material is preferred when high Bsat and high Tc are important. 3C92 is a new power material, optimised with respect to these parameters. The gain in saturation current can be as high as 50%. Application frequencies are up to 400 kHz, depending on ripple current.

NiZn material is preferred when high resistivity and low losses at high frequencies are required. Ferroxcube's materials 4A11 and 4B1 have the right characteristics for this application. 4A11 provides medium inductance, low saturation, high resistivity and low Tc. It operates up to 1 MHz. 4B1 provides lower inductance, medium saturation, high resistivity and high Tc and is recommended for operating frequencies between 1 and 3 MHz.

For more information contact Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za

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