3000
W
Fig. 6 Three phase rectifier bridge:
Power dissipation versus direct
output current and ambient
temperature
RthKA K/W
0.03
0.06
0.1
2500
Ptot
0.15
0.2
2000
1500
1000
500
0
0.3
0.4
Circuit
Circuit
B6U
B 6 U
3 x MDD312
3 x PSKD 312
0
200
400
600
800
0
25
50
75
100
125
TA
150
102
102
A
°C
IdAVM
0.20
K/W
Fig. 7 Transient thermal impedance
junction to case (per diode)
RthJC for various conduction angles d:
0.15
0.10
0.05
0.00
ZthJC
d
RthJC (K/W)
DC
0.120
0.128
0.135
0.153
0.185
180°C
120°C
60°C
30°C
30°
60°
120°
180°
DC
Constants for ZthJC calculation:
i
Rthi (K/W)
ti (s)
1
2
3
4
0.0058
0.031
0.00054
0.098
0.54
10-3
10-2
10-1
100
101
s
t
0.072
0.0112
12
0.25
Fig. 9 Transient thermal impedance
junction to heatsink (per diode)
K/W
0.20
RthJK for various conduction angles d:
ZthJK
d
RthJK (K/W)
0.15
0.10
0.05
0.00
DC
0.160
0.168
0.175
0.193
0.225
180°C
120°C
60°C
30°C
30°
60°
120°
180°
DC
Constants for ZthJK calculation:
i
Rthi (K/W)
ti (s)
1
2
3
4
5
0.0058
0.031
0.072
0.0112
0.04
0.00054
0.098
0.54
12
10-3
10-2
10-1
100
101
s
t
12
POWERSEM GmbH, Walpersdorfer Str. 53
D - 91126 Schwabach
2003 POWERSEM reserves the right to change limits, test conditions and dimensions
Phone: 09122 - 9764 - 0 FAX: 09122 - 9764 - 20
POWERSEM [ POWERSEM GMBH ]
