HFA06TB120
Bulletin PD-2.382 rev. D 12/00
REVERSE RECOVERY CIRCUIT
V
R
= 200V
0.01
Ω
L = 70µH
D.U.T.
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
1. di
f
/dt - Rate of change of
current
through zero
crossing
2. I
RRM
- Peak reverse
recovery current
4. Q
rr
- Area under curve
defined by t
rr
and I
RRM
t
rr
X I
RRM
3. trr - Reverse recovery
Q
rr
=
time measured
from zero
2
crossing point of negative
going I
F
to point where a line 5. di
(rec)M
/dt - Peak rate of
passing through 0.75 I
RRM
change of current during t
b
and 0.50 I
RRM
portion of t
rr
extrapolated to zero current
Fig. 10 - Reverse Recovery Waveform and Definitions
5
IRF [ INTERNATIONAL RECTIFIER ]
