MOSFETs(Figures from Scherz, P. (2007) Practical Electronics for Inventors, 2nd ed., McGraw-Hill, NY)Metal Oxide Semiconductor Field Effect TransistorA voltage-controlled transistor in contrast to bipolar transistors, which are current controlledTwo types: enhancement-type and depletion-typeEnhancement-types are normally OFF (drain to source channel flows minimum current) when there is no gate-to-source voltage, and begins to turn on (channel becomes less resistive) as VGS becomes greater than zeroDepletion-types are normally ON (drain-source channel flows maximum current) with no gate-source voltage difference. A gate-source voltage causes the drain-source channel to become moreresistive.BJ Furman | ME 106 Intro to Mechatronics | MOSFETs.doc | 27SEP2010 Page 1 of 2Examples of Power MOSFETsIRL520Logic level gate drive (RDS(on) at 5V)IRF520More typical gate drive (RDS(on) at 10V)BJ Furman | ME 106 Intro to Mechatronics | MOSFETs.doc | 27SEP2010 Page 2 of 2(Off until VGS > 0 V)(On until VGS > 0 V)(Off until VGS < 0 V)(On until VGS < 0 V)Must suppress transient voltages! See:
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