We are doing battery heat testing and want to be able to vary the current in the circuit to different test points up to 100A. Our circuit schematic is attached. The MOSFET is IXFN360N10T. We attached the MOSFET to a piece of aluminum with thermal paste underneath. The circuit works extremely well below about 20A. A change of 0.01V at V1 causes a 1A change through out test battery. Vds is around 3.7V at max.
However, the MOSFET heats up significantly and smokes out. According to the SOA chart, we should be well within the safe operating range of the transistor. What is going on and what can be done to perform the test that we want?
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