Summary edit

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Current vs Voltage curves of a MOSFET operating in the ohmic region and a diode. At low current values, the voltage drop in the MOSFET is less than in the diode (due to its threshold voltage). When the current increases, the forward voltage drop of the diode does not increase as much as that of the MOSFET. In consequence, for high currents, the losses (current times voltage) are less in the diode than in the MOSFET. However, by connecting several MOSFETs in parallel, it is possible to reduce their R_DSon as can be seen in the figure (orange curve). Paralleling several diodes will not modify their threshold voltage.

 

This plot was created with Gnuplot.

=20 m{/Symbol W}',\

	MOSFET2(x) ls 4 title 'MOSFET R{_{DSon}}=10 m{/Symbol W}',\

diode(x) ls 2 title 'Diode' }}

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