The reverse recovery time of a diode is trr = 5s and the softness factor is SF

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Question:

The reverse recovery time of a diode is trr = 5μs and the softness factor is SF = 0.5. Plot both (a) the storage charge Qrr and (b) the peak reverse current Irr against the rate of fall of the diode current from 100 A/μs to 1 kA/μs with an increment of 100 A/μs.