© 2000 IXYS All rights reserved
MCC 44
MCD 44
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
Fig. 8 Transient thermal impedance
junction to case (per thyristor or
diode)
RthJC for various conduction angles d:
d
DC
180°
120°
60°
30°
RthJC (K/W)
0.53
0.55
0.58
0.6
0.62
Constants for ZthJC calculation:
i
Rthi (K/W)
ti (s)
1
0.015
0.0035
2
0.026
0.02
3
0.489
0.195
Fig. 9 Transient thermal impedance
junction to heatsink (per thyristor
or diode)
RthJK for various conduction angles d:
d
DC
180°
120°
60°
30°
R (K/W)
thJK
0.73
0.75
0.78
0.8
0.82
Constants for ZthJK calculation:
i
Rthi (K/W)
ti (s)
1
0.015
0.0035
2
0.026
0.02
3
0.489
0.195
4
0.2
0.68
4-4