Power dissipated across a mosfet
Zap-o
Posts: 452
So I was reading the PDF "process and control" and came across the transistor curve for power.
My question is, will a mosfet have the same characteristics? Obviously its not linear but will the power go down as the mosfet is saturated?
I did run some numbers and came up with a plot of my own - just wondering if I did it right?
The X numbers are Gate voltage and the Y numbers is Watts
I used a common source schematic for the calculations in my plot.
Post Edited (Zap-o) : 6/15/2010 1:00:11 PM GMT
My question is, will a mosfet have the same characteristics? Obviously its not linear but will the power go down as the mosfet is saturated?
I did run some numbers and came up with a plot of my own - just wondering if I did it right?
The X numbers are Gate voltage and the Y numbers is Watts
I used a common source schematic for the calculations in my plot.
Post Edited (Zap-o) : 6/15/2010 1:00:11 PM GMT
693 x 478 - 46K
713 x 437 - 25K
Comments
Simple answer: yes.
Take a look at a MOSFET data sheet and you'll find a similar power curve. Anything between "all on" and "all off" is where the FET drain/source junction will dissipate power (heat).
Regards,
DJ
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Grab the MOSFET-in-question datasheet and confirm. Then your assurance will move to confidence.
"Measure twice - Cut once",
DJ
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www.irf.com/product-info/datasheets/data/irf4905pbf.pdf
The curve in question is on page 4, figure 8 "Maximum Safe Operating Area".
Regards,
DJ
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