Transcription of Power MOSFET Basics: Understanding MOSFET Characteristics ...
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Power MOSFET Basics: Understanding MOSFET Characteristics ...
AN605 Vishay SiliconixDocument Number: MOSFET Basics: Understanding MOSFET Characteristics AssociatedWith The Figure of MeritJess Brown, Guy MoxeyINTRODUCTIONP ower MOSFETs have become the standard choice as themain switching device for low-voltage (<200 V) switchmodepower-supply (SMPS) converter applications. However usingmanufacturers datasheets to choose or size the correctdevice for a specific circuit topology is becoming increasinglydifficult. The main criteria for MOSFET selection are the powerloss associated with the MOSFET (related to the overallefficiency of the SMPS) and the Power -dissipation capabilityof the MOSFET (related to the maximum junction temperatureand thermal performance of the package).
With a large variety of topologies, switching speeds, load currents, and output voltages available, it has become impossible to identify a generic MOSFET that offers the best performance across the wide range of circuit conditions. In some circumstances the on-resistance (rDS(on)) losses dominate, and in others it is the switching losses of the
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