STD/SDT70
Thyristor-Diode Modules, Diode-Thyristor Modules
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
3 x STD/SDT70
STD/SDT70
Fig. 8 Transient thermal impedance
junction to case (per thyristor or
diode)
R
thJC
for various conduction angles d:
d
DC
180
o
C
120
o
C
60
o
C
30
o
C
R
thJC
(K/W)
0.3
0.31
0.33
0.35
0.37
Constants for Z
thJC
calculation:
i
1
2
3
R
thi
(K/W)
0.008
0.054
0.238
t
i
(s)
0.0019
0.047
0.3
STD/SDT70
Fig. 9 Transient thermal impedance
junction to heatsink (per thyristor
or diode)
R
thJK
for various conduction angles d:
d
DC
180
o
C
120
o
C
60
o
C
30
o
C
R
thJK
(K/W)
0.5
0.51
0.53
0.55
0.57
Constants for Z
thJK
calculation:
i
1
2
3
4
R
thi
(K/W)
0.008
0.054
0.238
0.2
t
i
(s)
0.0019
0.047
0.3
1.25
SIRECT [ Sirectifier Global Corp. ]
