HFA75MB40C Datasheet, PDF (5/5 Pages) International Rectifier – Ultrafast, Soft Recovery Diode HEXFRED

HFA75MB40C
REVERSE RECOVERY CIRCUIT
V_R = 200V
L = 70µH
0.01 Ω
D.U.T.
dif/dt
ADJUST _G
D
IRFP250
S
IF
0
3
trr
ta
t_b
2
I _RRM
4
Q_rr
0.5 I _RRM
di(rec)M/dt ⁵
0.75 I_RRM
1 _{dif /dt}
1. dif/dt - Rate of change of current
through zero crossing
2. IRRM - Peak reverse recovery current
3. trr - Reverse recovery time measured
from zero crossing point of negative
going IF to point where a line passing
through 0.75 IRRM and 0.50 IRRM
extrapolated to zero current
4. Qrr - Area under curve defined by trr
and IRRM
trr X IRRM
Qrr =
2
5. di(rec)M/dt - Peak rate of change of
current during t_b portion of t_rr
Fig. 9 - Reverse Recovery Parameter Test
Circuit
Fig. 10 - Reverse Recovery Waveform and
Definitions
DUT
CURRENT
MONITOR
L = 100µH
Rg = 25 ohm
HIGH-SPEED
SWITCH
FREE-W HEEL
DIODE
+
Vd = 50V
I _L(PK)
V (AVAL)
V R(RATED)
DE CAY
TIME
Fig. 11 - Avalanche Test Circuit and Waveforms
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