Hi, I'm making a brushless motor driver like http://ww1.microchip.com/downloads/en/AppNotes/01175A.pdf (page 2). I need to be able to control 44.4 volts, 80 amps. I chose http://www.infineon.com/dgdl/IPB019...e0e77&fileId=db3a30431ddc9372011e2600a49e467b MOSFET. Here are my calculations.
I=80 amps
R=0.0019 ohms
P=I^2*R=12.16 watts
That MOSFET has a maximum power dissipation of 250 watts. I tried to calculate the temperature (probably doing it wrong though).
Temperature=room temperature+thermal resistance*P=20+62*12.16=773.92 degrees celsius
That is extremely high. Am I calculating it right, or do I need a different MOSFET/multiple MOSFETs in parallel. I will be mounting 6*number of MOSFETS in parallel (1 right now) on an aluminium square tube that has a volume of 76 square centimeters (I may need a longer one, meaning more volume), so I guess you could halve the temperature (just a guess) because it will act as a heat sink. Thanjs,
I=80 amps
R=0.0019 ohms
P=I^2*R=12.16 watts
That MOSFET has a maximum power dissipation of 250 watts. I tried to calculate the temperature (probably doing it wrong though).
Temperature=room temperature+thermal resistance*P=20+62*12.16=773.92 degrees celsius
That is extremely high. Am I calculating it right, or do I need a different MOSFET/multiple MOSFETs in parallel. I will be mounting 6*number of MOSFETS in parallel (1 right now) on an aluminium square tube that has a volume of 76 square centimeters (I may need a longer one, meaning more volume), so I guess you could halve the temperature (just a guess) because it will act as a heat sink. Thanjs,