The RMS current seen by the ZVS MOSFET is small. A
MOSFET with reduced capacitance and higher on-resistance
is required in order to reduce switching losses. Fairchild’s
FCP7N60 N-Channel MOSFET is selected as the auxiliary
switch—rated at 600V, 7A, with ROS(on) = 0.53Ω (25°C), Coss
~ 60pF.