File:Diode mosfet.svg
Summary
| Description |
English: 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 (magenta curve). Paralleling several diodes will not modify their threshold voltage.
Created using maxima
Русский: Зависимости тока от напряжения для полевого МОП-транзистора, работающего в омической области, и диода. При малых значениях тока падение напряжения на MOSFET меньше, чем на диоде (из-за его прямого падения напряжения). Когда ток увеличивается, прямое падение напряжения на диоде не увеличивается так быстро, как на MOSFET. Как следствие, для больших токов потери (ток, умноженный на напряжение) в диоде меньше, чем в MOSFET. Однако, подключив несколько полевых МОП-транзисторов параллельно, можно уменьшить их сопротивление во включённом состоянии, как показано на рисунке (пурпурная кривая). Параллельное соединение нескольких диодов не изменит их пороговое напряжение и выигрыш в рассеиваемой мощности будет незначительным. |
| Date | |
| Source | File:Diode mosfet.png |
| Author | User:CyrilB |
| Other versions |
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| SVG development | Category:Valid SVG created with Gnuplot code:Charts#Diode%20mosfet.svg  This plot uses embedded text/digits. |
| Source code |
diode(x) := 0.026*log(x*1e9+1);
MOSFET(x) := x*0.02;
MOSFET2(x) := x*0.01;
load(draw);
draw2d(terminal=svg,file_name="Diode_mosfet",dimensions=[480,320],
color=black,font="Times",font_size=10,nticks=75,proportional_axes=none,
user_preamble="set termoption enhanced;set mxtics; set mytics; set key bottom right",
xtics_axis=false,ytics_axis=false,grid=true,points_joined=true,yrange=[0,1],
xaxis=false,yaxis=true,axis_top=true,axis_bottom=true,axis_left=true,axis_right=true,
line_width=2,/*label(["x",1.,0.1],["y",0.1,1.]),*/xlabel="Current [A]",ylabel="Voltage [V]",
color=blue,key="Diode",explicit(diode(x),x,0,60),
color=red,key="MOSFET R_{DSon}=20 mO",explicit(MOSFET(x),x,0,60),
color=magenta,key="MOSFET R_{DSon}=10 mO",explicit(MOSFET2(x),x,0,60),key="",
color=black,line_type=dots,line_width=0.75,head_both=true,head_type=nofilled,
point_type=dot,head_angle=20,head_length=1,
vector([0,0.7],[31.6,0]),vector([31.6,.7],[60-31.6,0]),points([ [31.6,.6],[31.6,.72] ]),
label(["less losses in the 20 mO MOSFET",16,.72],["less losses in the diode",50,.72])
);
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Licensing
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- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
