HFA135NH40
PD-2.465 rev. B 03/99
3
I
F
t
rr
t
a
t
b
4
REVERSE RECOVERY CIRCUIT
V
R
= 200V
0
Q
rr
I
RRM
2
0.5 I
RRM
di(rec)M/dt
5
0.01
Ω
L = 70µH
D.U.T.
D
IRFP250
S
1
0.75 I
RRM
di
f
/dt
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
dif/dt
ADJUST G
1. di
f
/dt - Rate of change of current
through zero crossing
2. I
RRM
- Peak reverse recovery current
3. trr - 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
Fig. 9
- Reverse Recovery Parameter Test
Circuit
L = 100µH
HIGH-SPEED
SWITCH
Rg = 25 ohm
CURRENT
MONITOR
FREE-WHEEL
DIODE
+
Vd = 50V
Fig. 10
- Reverse Recovery Waveform and
Definitions
I
L(PK)
DUT
DECAY
TIME
V
(AVAL)
V
R(RATED)
Fig. 11
- Avalanche Test Circuit and Waveforms
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5
IRF [ INTERNATIONAL RECTIFIER ]
