Q1. A thyristor has a steady state power loss of 35 watts. If the heat resistance of the bond to the heatsink is 1.25°C/W, the allowable temperature of the bond and the maximum ambient temperature are 150 °C and 40 °C, respectively. In this case, which of the following heatsinks can be used? a. Sk511 b. SK423 c. SK189 d. SK422 R K/WI K/WI 15 14 12 12 10 6 43,1 SK423 SK511 50 100 150 200 Imm 50 100 150 200 (mm) 4 IK/WI 3 2 41,5 50 100 150 200 (mm) 50 100 150 200 (mm) SK189 SK422 16,51 -

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