Transcription of Topic 4 Designing Planar Magnetics - Texas Instruments
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Topic 4 Designing Planar Magnetics - Texas Instruments
Topic 4 Designing Planar Magnetics 4-1 Designing Planar Magnetics Lloyd Dixon, Texas Instruments ABSTRACT Planar magnetic devices offer several advantages over their conventional counterparts. This paper dis-cusses the magnetic fields within the Planar structure and their effects on the distribution of high fre-quency currents in the windings. Strategies for optimizing Planar design are presented, and illustrated with design examples. Circuit topologies best suited for high frequency applications are discussed. I. ADVANTAGES OF Planar Magnetics In contrast to the helical windings of conven-tional magnetic devices, the windings of Planar transformers and inductors are located on flat sur-faces extending outward from the core centerleg. Fig. 1. Planar transformer. magnetic cores used with Planar devices have a different shape than conventional cores used with helical windings. Compared to a conven-tional magnetic core of equal core volume, de-vices built with optimized Planar magnetic cores usually exhibit: Significantly reduced height (low profile) Greater surface area, resulting in improved heat dissipation capability.
4-2 Inductance is simply an electrical circuit con- cept which enables the circuit designer to predict and quantify the effects of magnetically stored energy in the electrical circuit.
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