Mosfet Power
Posted on Saturday, June 5, 2010 in Car Amplifiers
How to test a power mosfet?
Let's assume it is an N-channel enhancement device (the most common). Do an ohms check from the gate to the source with the positive meter probe on the gate. It should read an open circuit.
Then short the gate to the source and ohms check the drain-to-source path (pos. on drain). It should read open circuit.
Then make the gate about +5V higher than the source and ohms check the drain to source path (pos. on drain). It should be a short circuit now. (The proper gate voltage is in the range of 3V to 10V. If you go too high you can destroy it; check the datasheet!)
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