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Load characteristics of a spiral coil type thin film microtransformer

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5 Author(s)
Yamaguchi, K. ; Amorphous Magnetic Device Lab., Sendai, Japan ; Sugawara, E. ; Nakajima, O. ; Matsuki, H.
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A spiral coil type thin film microtransformer with a size of 2.4×3.1 mm2 is fabricated using photolithography techniques for application in megahertz region switching regulators. An amorphous magnetic film of a multilayered CoNbZr/SiO2 is used as a magnetic core. Load characteristics are measured at 10 MHz. A comparatively high efficiency of 67% and an acceptable excitation current of 25 mA are obtained, in spite of the small size of the microtransformer

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Magnetics, IEEE Transactions on  (Volume:29 ,  Issue: 6 )