Advantages of low parasitic inductance packages of power MOSFET for server power applications

Super -junction MOSFETs and shielded gate trench MOSFETs are widely used especially for PFC and DC-DC converters for networking and computing power supply systems that require high efficiency and power density. With smaller parasitic capacitances, the latest SJ MOSFETs have extremely fast switching characteristics and therefore reduced switching losses. But, naturally this switching behavior leads to device stress include voltage and current spikes and greater dv/dt and di/dt by self-inflicted voltage transients during switching transition time due to the stray parasites in devices and printed circuit board. In this paper, the impact of parasitic inductances in Power MOSFET and PCB layout during switching transient by analytical Pspice simulation and experimental results The benefits of low inductance packages, called Power88 and Power 56, for high voltage and medium voltage MOSFETs are shown in server power system.