There are some factors to consider in calculating MOSFET power dissipation. When the power dissipation is known, it is possible to compute the junction temperature of the MOSFET. Important to take that a MOSFET installed with no heatsink has different computation strategy compared to the one with a heatsink. Small current or low power MOSFETs are usually mounted to PCB
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It is very common application to drive a relay with a MOSFET. From household applications to automotive are using this circuit. There are some aspects to consider like the stress on the MOSFET, the level of driving voltage to guarantee MOSFET saturation, the level of the actual voltage applied to the relay coil if enough to meet the requirement and
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here are only few power MOSFET design equations to take note when doing design involving this electronic part. You may try deriving these equations if you want a better understanding on how these formulated. These are also given in application notes and some technical blogs but maybe in different form but will result to the same calculation results.
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MOSFET RDSon temperature coefficient is positive. Meaning, it will increase with increasing temperature. In this article I will discuss and interpret MOSFET RDSon temperature coefficient that is often given in the form of graph in datasheets like below. Datasheets may also provide actual RDSon data with respect to junction temperature instead of the coefficient like below. Datasheets also provides tabular
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Below are the guides on how to know if MOSFET is defective. These are the most common techniques that can be used to check if MOSFET is defective. Step #1 on How to Know if MOSFET is Defective :Diode Check The first thing we will try on how to know if MOSFET is defective is to check the diode drop.
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