Experimental circuit analysis demonstrates load-current-dependent voltage imbalance in series-connected power MOSFETs, indicating that adjusted gate timing can balance electrical stress.
This paper discusses the voltage-sharing characteristics of series-connected MOSFETs based on circuit analysis and experimental verification, focusing on the relationship between the load current and voltage deviation. The analysis reveals that the occurrence of the Miller plateau depends on the amount of the load current during the turn-on and/or -off. However, independent of the Miller plateau, the voltage deviation is related to the difference in the output capacitance between series-connected MOSFETs as well as in the other stray capacitance around the circuit. Therefore, a higher voltage is always applied across the lower MOSFET in the upper arm even when the MOSFETs are simultaneously turned off. Furthermore, the analysis derives the gate timing for suppressing the voltage deviation as a function of the load current. Experimental results verify the analysis using a buck converter consisting of two series-connected MOSFETs.
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Umano et al. (2026) studied this question.
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