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Power MOSFET Basics: Understanding MOSFET …
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). This applicationnote focuses on the basic characteristics and understandingof the are several factors which affect the gate of theMOSFET, and it is necessary to understand the fundamentalbasis of the device structure before the MOSFET behavior canbe explained.
AN605 Vishay Siliconix Document Number: 71933 08-Sep-03 www.vishay.com 3 FIGURE 2. Trench DMOS 3D cross-section, with associated resistive elements.
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