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In this question we will cover the switching transient of a power diode with some modified
modeling assumptions. Following are the assumptions to be considered for analysis in this
question. Neglect other non-idealities such as parasitic inductance, etc.:
i. The device has a fixed depletion capacitance, Cj=1nF, under reverse bias and no
effect under forward bias.
ii. The device is considered to be in reverse bias when Cj is charged.
iii. The device has a fixed diffusion capacitance, Cd=50nF, for buildup of injected charge
under forward bias, 100nC≥Qd≥0 and then does not accumulate any more charge.
iv. The ON-resistance of the diode is 0.5Ω for Qd<60nC and reduces to 10mΩwhen
Qd≥60nC due to conductivity modulation.
v. Diode has zero reverse saturation current.
The diode is initially reverse biased with VD=-1000V at the terminals and is turned on
with a step current of Io=100A at t=0.
a) What are the values of Qd, Qj, Cd and Cj at t<0. b) What is the voltage VD at the diode terminals at t=0+.
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