The diode ON and OFF states are controlled by the voltage and current conditions across the device itself.
The diode assumes a fixed small ON and a large OFF resistance. Conduction commences when the device is forward biased and the forward voltage exceeds the Forward Voltage Drop input parameter. The diode turns OFF at a current zero and remains OFF as long as it is reverse biased.
The V-I characteristic for the diode model is shown below:
Both ON and OFF events use the Interpolation Algorithm to calculate the instant of switching. Thus, turn ON occurs exactly when forward voltage reaches the Forward Voltage Drop and turn OFF occurs exactly when current reaches zero.
NOTE: Reverse recovery time (i.e. the time for which a finite reverse current flows in the device, following a turn OFF) of the diode is assumed zero. If the ON resistance is zero or smaller than the Switching Threshold value, the closed state will be modeled as an ideal short circuit.
