Recently, high power-density, high power-efficiency, and wide regulation range isolated DC-DC converters have been required.\nThis paper presents considerations of physical design and implementation for wide regulation range MHz-level LLC resonant DCDC\nconverters. The circuit parameters are designed with 3ââ?¬â??5MHz-level switching frequency. Also, the physical parameters and\nthe size of the planar transformer are optimized by using derived equations and finite element method (FEM) with Maxwell 3D.\nSome experiments are done with prototype LLC resonantDC-DC converter using gallium nitride high electron mobility transistors\n(GaN-HEMTs); the input voltage is 42ââ?¬â??53V, the reference output voltage is 12V, the load current is 8 A, the maximum switching\nfrequency is about 5MHz, the total volume of the circuit is 4.1 cm3, and the power density of the prototype converter is 24.4 W/cc.
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