A huge one !Hi,
my question is what type of a heat sink do i need to use for this Mosfet. thanks In advance.
You have to calculate the power dissipation, then select a heatsink based on allowable maximum temperature rise.Hi,
i am using a N channel mosfet IRF 1405 to drive a 19A fan motor. the mosfet is controlled by a 10K potentiometer & 50K NTC. my question is what type of a heat sink do i need to use for this Mosfet. thanks In advance.
However, if a FET is used as a "saturated" switch (fully cranked ON), power is calculated as:Huge.
I think you just said you are using the mosfet in the linear region where P=IE and the voltage is unknown. Power = current times voltage.
its supply voltage is 12 volts. thanks a lot!What is the fan supply voltage? From the maximum power theorem the maximum MOSFET dissipation will occur when the voltage across the MOSFET is 1/2 the supply voltage but that's for a resistive load. Since the fan is a variable load it's more difficult to accurately determine the maximum power point, but it's likely to be no more than 1/2 the supply voltage times 1/2 the maximum fan current.
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