I have AVR that needs to drive 12V 1A motor.
I always used NPN BJTs (2N2222), but reading the datasheet says the MAX is 1A (which means I cannot use it here).
Instead, I willing to use MOSFET. I have several N-Channel IRFZ44N.
- Reading the datasheet says Vgs(th) is 2-4V, and I am driving it from the AVR (5V), should be fine, right?
- N-channel MOSFET needs to be on the low-side, right? means Source to GND, Drain to motor.
- Do I need resistors on the Drain, Source paths?
- Gate current - the AVR will drive max of 20mA 5V on the gate to switch the FET on, do I need resistor between the AVR pin and the Gate pin? I don't want to overload the AVR, and I cannot find the current the FET pull.
- Do I need pull-down resistor on the AVR pin - Gate path, connected to GND?
I never used FET transistors, so I had may some newbie questions (and this is after reading the datasheet for several times and spending hours online reading about FET)
On one of the sites I saw this basic diagram for N-channel MOSFET:
Is the diagram will be accurate for connecting my AVR to the Motor? I mean, no resistors at all (only the pull-down one)? won't it overload the AVR?