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MDD142

High Power Diode Modules

IXYS CORPORATION 

© 2000 IXYS All rights reserved

MDD 142

Fig. 5 Three phase rectifier bridge:

Power dissipation versus direct

output current and ambient

temperature

Fig. 6 Transient thermal impedance

junction to case (per diode)

RthJC for various conduction angles d:

d

DC

180°

120°

60°

30°

RthJC (K/W)

0.210

0.223

0.233

0.260

0.295

Constants for Z calculation:

thJC

i

Rthi (K/W)

ti (s)

1

0.0087

0.001

2

0.0163

0.065

3

0.185

0.4

Fig. 7 Transient thermal impedance

junction to heatsink (per diode)

RthJK for various conduction angles d:

d

DC

180°

120°

60°

30°

R (K/W)

thJK

0.31

0.323

0.333

0.360

0.395

Constants for ZthJK calculation:

i

Rthi (K/W)

ti (s)

1

0.0087

0.001

2

0.0163

0.065

3

0.185

0.4

4

0.1

1.29

3-3

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