VS-HFA320NJ40CPbF
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Vishay Semiconductors
Revision: 28-Oct-16
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Document Number: 94072
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Fig. 9 - Maximum Thermal Impedance Z
thJC
Characteristics (Per Leg)
Fig. 10 - Reverse Recovery Parameter Test Circuit
Fig. 11 - Reverse Recovery Waveform and Definitions
0.01
0.1
1
0.00001 0.0001 0.001 0.01 0.1
1
t
1
- Rectangular Pulse Duration (s)
Z
thJC
- Thermal Response
Single pulse
(thermal response)
0.001
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
10
IRFP250
D.U.T.
L = 70 μH
V
R
= 200 V
0.01 Ω
G
D
S
dI
F
/dt
adjust
Q
rr
0.5 I
RRM
dI
(rec)M
/dt
0.75 I
RRM
I
RRM
t
rr
t
b
t
a
I
F
dI
F
/dt
0
(1)
(2)
(3)
(4)
(5)
(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 dened by t
rr
and I
RRM
t
rr
x I
RRM
2
Q
rr
=
(5) dI
(rec)M
/dt - peak rate of change of
current during t
b
portion of t
rr
