30ETH06, 30ETH06S, 30ETH06-1
Bulletin PD-20748 rev. D 08/01
Reverse Recovery Circuit
V
R
= 200V
0.01
Ω
L = 70µH
D.U.T.
di
F
/dt
dif/dt
ADJUST
D
G
IRFP250
S
Fig. 9- Reverse Recovery Parameter Test Circuit
3
I
F
0
t
rr
t
a
t
b
4
2
Q
rr
I
RRM
0.5 I
RRM
di(rec)M/dt
0.75 I
RRM
5
1
di
F
/dt
f
1. di
F
/dt - Rate of change of current through zero
crossing
2. I
RRM
- Peak reverse recovery current
3. t
rr
- Reverse recovery time measured from zero
crossing point of negative going I
F
to point where
a line passing through 0.75 I
RRM
and 0.50 I
RRM
extrapolated to zero current
4. Q
rr
- Area under curve defined by t
rr
and I
RRM
t
rr
x I
RRM
Q
rr
=
2
5. di
(rec) M
/ dt - Peak rate of change of
current during t
b
portion of t
rr
Fig. 10 - Reverse Recovery Waveform and Definitions
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