IRL540 is not a good mosfet to use for switching 10A, its Rds(on) is 0.077 ohms max so it will dissipate around 7.7W when carrying 10A. Look for a mosfet with much lower Rds(on), such as IRLU8726PBF (0.008 ohms max). Hi dc42, no offense intended here, but I think you made a little error on the math.
The BJT is the bipolar junction transistor, the PCT is the point contact transistor, the UJT is the uni-junction transistor, the SBT is the surface barrier transistor, the FET is the field effect. The dissipation would be the IRL540 should work but it will get a little hot. With an R DS ot 0.077ohms will give about. 77W at 10A which will mean a rise in temperature of about 48C degrees C over ambient. With an ambient of 20C, that would give a temperature just under 70C which should be quite safe at that current where the maximum allowable case temperature is about 155C. Other capacitances should be negligible for your use.Īlthough the IRLU8726 would probably be a lot cooler.Īs stated a small gate resistor might be a good idea for PWM use to reduce current draw from the MCU a bit, the value of 150ohms seems okay and is not critical, use something between 150 and 470 and you should be fine. What contains a 2n3055 transistor full#.
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