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MOSFET Maximum Power Dissipation and SOA?

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carpenter

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I choose the transistor for Electronics Load .
In datasheet Vishay IRFP150
is in ABSOLUTE MAXIMUM RATINGS Maximum Power Dissipation 230W.
and in Fig. 8 - Maximum Safe Operating Area I see 50V 10A in DC area and this is 500W.
THERMAL RESISTANCE RATINGS is Case-to-Sink, Flat, Greased Surface 0,24C/W this is 120C for 500W.
I do not know it a little.
 

in Fig. 8 - Maximum Safe Operating Area I see 50V 10A in DC area
Click to expand...
There's no DC line (or "area") in the SOA diagram at all!

Case-to-Sink, Flat, Greased Surface 0,24C/W
Click to expand...
Case-to-sink thermal resistance effectively adds to junction-to-case, or in other words, assumed case temperature of 25 °C would require a negative heat sink temperature. Thus specified 230 W can't be achieved in a real design. Realistically there will be a considerable sink-to-ambient thermal resistance. At the end, you'll be lucky if you achieve 80 or 100 W continuous power dissipation.
 
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