1. 8 pn Junction Diode : Transient Response

2. 8.1 TURN-OFF TRANSIENT 8.1.1 Introduction trr: reverse recovery time
ts : storage time or storage delay time
trr: reverse recovery time
tr : trr-ts
For t<0
For t > trr

3. 8.1.2 Qualitative Analysis
Why is there a delay in going from the on-state to the off-state?
In ideal p+-n diode, i=AJP(x)=
-qADPdΔpn/dx|x=xn

4. 8.1.3 The Storage Delay Time Quantitative Analysis
Form the charge control approach,
i=-IR for 0+≤t<ts
giving
(8.3)
(8.4)
(8.5)
From QP(tS)=0

5. Measurement

6. 8.1.4 General Information
8.2 TURN-ON TRANSIENT

7. From the charge control approach,
(8.10)
(8.11)
(8.12)
(8.13)

8. Under a steady state conditions, the stored hold charge in ideal diode
VA→ vA
… Steady state (8.14)
(8.15)
(8.16)