Electronics > Microcontrollers

Microcontrollers Resistor

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jaRON:
do i need a Resistor between the Microcontroller and the Transistor it is irf44

buffalo960:
https://www.youtube.com/embed/Te5YYVZiOKs

Psi:
Assuming 5V drive, you should put a low value resistor, like 200 ohms, between the microcontroller and the gate.
It insures that the current can never get above 25mA  (5V/200) which is safe for the microcontroller i/o port.

It would work fine without the resistor but it's always a good idea to use it anyway.
Resistors are cheap, mosfets and microcontrollers, not so much.

buffalo960:
Is there any way (other then switching the mosfet really fast) that the gate current would rise above very low levels?

Psi:
Yeah, if the mosfet blew up (as they sometimes do) it might short the mosfet supply rail to the micro i/o and damage it. Especially if the mosfet rail is higher than 5V

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