Abstract

In this paper, a tapped-inductor (TI) buck converter using planar coupled inductor is presented for low power applications. The duty cycle of TI buck is much wider compared with traditional buck converter under same voltage conversion ratio conditions. Therefore, it is suitable for high step-down applications. With synchronous conduction mode (SCM), TI buck converter obtains zero voltage switching (ZVS) of both switches and thus be able to operate at high switching frequency. Besides, compared with other three-switch buck-type topologies, its simplicity in circuit topology leads to less gate driver and other auxiliary power loss, which is beneficial for low power applications. In this paper, converter operating principle and design for a compact coupled inductor are presented. Finally, experimental results of a 15-W prototype are given. Under switching frequency of 2 MHz, the peak efficiency of power stage reaches to 89 % with magnetic component size less than 150 mm3.

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