Optikon you are right if the MOSFET is in an amplifier and biased for class A operation. AudioGuru is right when the MOSFET is used as a switch in say a class D amplifier. Two different applications and two different effects as the junction temperature increases.
As you can see from the diagram, at high drain currents the SOA is limited by the RDSon value which increases with temperature. (IRLZ44)
As you can see from the diagram, at high drain currents the SOA is limited by the RDSon value which increases with temperature. (IRLZ44)
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