VHFD 37
70
A
60
I
F
50
40
30
100
20
300
A
50Hz, 80% V
RRM
10
3
As
I
2
t
2
V
R
= 0 V
typ.
250
I
FSM
200
T
VJ
= 45掳C
T
VJ
= 45掳C
T
VJ
= 125掳C
T
VJ
= 125掳C
T
VJ
= 25掳C
max.
150
10
2
T
VJ
= 125掳C
10
0
0.0
50
0.5
1.0
V
F
1.5
V 2.0
0
0.001
10
1
0.01
0.1
t
s
1
1
2
3
4 5 6 7 8 910
ms
t
Fig. 3 Forward current versus voltage
drop per diode
120
W
100
P
tot
80
Fig. 4 Surge overload current
Fig. 5 I
2
t versus time per diode
50
A
R
thHA
:
0.5
1.0
1.5
2.0
3.0
4.0
6.0
K/W
K/W
K/W
K/W
K/W
K/W
K/W
40
I
d(AV)M
30
60
20
40
10
20
0
0
10
20
30
40
I
F(AV)M
A
0
20
40
60
80
100 120 掳C
140
T
amb
0
0
20
40
60
80 100 120 掳C
T
H
Fig. 6 Power dissipation versus direct output current and ambient temperature
2.0
K/W
1.5
Z
thJH
Fig. 7 Max. forward current versus
heatsink temperature
1.0
Constants for Z
thJH
calculation:
i
R
thi
(K/W)
0.005
0.2
0.875
0.47
t
i
(s)
0.008
0.05
0.06
0.25
0.5
1
2
3
4
0.01
0.1
1
t
s
10
0.0
0.001
Fig. 8 Transient thermal impedance junction to heatsink
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1
2
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