A MOSFET carries out switching operation according to the G-S voltage. It depends on your circuit configuration, but depending on how you are using it there is the possibility that G-S voltage could be undefined and thus correct operation would not occur. Possible issues are as follows.
- Oscillation could occur when the gate to source voltage is close to the threshold voltage.
- When turning on: If sufficient gate to source voltage is not obtained, drain current will flow while the drain to source voltage has not dropped. This is outside the area of safe operation.
- When turning off: Gate to source voltage could be caused by noise on the power supply line or by voltage fluctuation. This would cause malfunction and unintended operation of the load.
|Power MOSFETs for General Switching|