Owner's manual

VS-HFA220FA120
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Vishay Semiconductors
Revision: 22-Mar-12
4
Document Number: 93636
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Fig. 8 - Typical Peak Recovery Current vs. dI
F
/dt Fig. 9 - Typical Junction Capacitance vs. Reverse Voltage
Note
(1)
Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward power loss = I
F(AV)
x V
FM
at (I
F(AV)
/D) (see fig. 5);
Pd
REV
= Inverse power loss = V
R1
x I
R
(1 - D); I
R
at V
R1
= Rated V
R
Fig. 10 - Reverse Recovery Parameter Test Circuit
Fig. 11 - Reverse Recovery Waveform and Definitions
1000100
0
10
20
30
40
50
V
R
= 200 V
I
F
= 50 A, T
J
= 25 °C
I
F
= 50 A, T
J
= 125 °C
I
RR
(A)
dI
F
/dt (A/μs)
V
R
- Reverse Voltage (V)
C
T
-
Junction Capacitance (pF)
10
100
1000
10 100 1000 10 000
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 dened 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