File:Diode mosfet.png
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[edit] Summary
Cyril BUTTAY
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 RDSon as can be seen in the figure (orange curve). Paralleling several diodes will not modify their threshold voltage.
This file has been generated using gnuplot 4.0 and the following source code:
# This file is used to plot the U=f(I) of a diode and
# a MOSFET to show the benefits of synchronous rectification
# graph configuration
set terminal postscript eps enhanced "Times-Roman" 24 color solid
set encoding iso_8859_15
unset title
set line style 1 lt 1 lw 3 pt 0 ps 0
set line style 2 lt 3 lw 3 pt 0 ps 0
set line style 3 lt 7 lw 1 pt 0 ps 0
set line style 4 lt 8 lw 3 pt 0 ps 0
set border 15 lt 7 lw 4
set mxtics
set mytics
set grid xtics ytics
set xlabel "Current [A]"
set ylabel "Voltage [V]"
set format y '%0.1f'
set format x "%0.0f"
set key bottom right
set samples 1000
# diode forward voltage
diode(x)=0.026*log(x*1e9+1)
#MOSFET resistive behaviour, rdson=20mohms
MOSFET(x)=x*0.02
#MOSFET resistive behaviour, rdson=10mohms
MOSFET2(x)=x*0.01
#arrows
set arrow 1 from 0,0.7 to 31.6,0.7 heads ls 3
set arrow 2 from 31.6,0.7 to 60,0.7 heads ls 3
set arrow 3 from 31.6,0.6 to 31.6, 0.72 nohead ls 3
#labels
set label 1 'less losses in the 20 m{/Symbol W} MOSFET' center at 16,0.74 font "Times, 18"
set label 2 'less losses in the diode' center at 46,0.74 font "Times, 18" front
set output "diode_mosfet.eps"
plot [0:60][0:1] MOSFET(x) ls 1 title 'MOSFET R{_{DSon}}=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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:37, 1 April 2006 | | 1,500×1,050 (72 KB) | CyrilB (talk | contribs) | (Cyril BUTTAY 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 ) |
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