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Home > Issues > Volume 13 (2008) > No.2(pp.37-80)
Optimized Design of Low Voltage High Current Ferrite Planar Inductor for 10 MHz On-chip Power Module
Journal of Magnetics, Volume 13, Number 2, 30 Jun 2008, Pages 37-42
Abstract
In this paper, design parameters of high Q (> 50), high current inductor for on-chip power module were optimized by 4 Xs 3 Ys DOE (Design of Experiment). Coil spacing, coil thickness, ferrite thickness, and permeability were assigned to Xs, and inductance (L) and Q factor at 10 MHz, and resonance frequency (fr) were determined Ys. Effects of each X on the Ys were demonstrated and explained using known inductor theory. Multiple response optimizations were accomplished by three derived regression equations on the Ys. As a result, L of 125 nH, Q factor of 197.5, and fr of 316.3 MHz were obtained with coil space of 127㎛, Cu thickness of 67.8㎛ , ferrite thickness of 13.3㎛ , and permeability 156.5. Loss tan δ=0 was assumed for the estimation. Accordingly, Q factor of about 60 is expected at tan δ=0.02.
Keywords: DC-DC converter; DOE; ferrite inductor; Ni-Zn-Cu ferrite; on-chip power module; optimization
DOI: 10.4283/JMAG.2008.13.2.37
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