I have a 12v motor controlled by a standard mosfet, which is controlled by a mosfet driver, which is controlled by anb arduino. The mosfet is on the low side of the motor and the driver is an mic4422 connected as the datasheet (page 2) tell to.
My problem is that the driver output the same voltage of it's input, which is 5v. I need an output of at least 10v for the mosfet. So my question is, how can I input 12v to the driver, while conserving as little impedance as possible because. I need to run the mosfet on pwm and so I want it to switch as fast as possible to minimized the temperature.
What transistor setup, or anything else, do you suggest me?
For the mosfet, it will be a AUIRFS8409-7p, but I dont have it yet, so I'm trying with some IRFZ44N, but I have some overheat problem.
What you need is a logic level gate mosfet. The gate needs to be fully on or the resistance of the drain/source is not at its least so causes heat.
My favourite small mosfet is NTD5867NL. It works with 5v on the gate and handles a few amps with ease. They are cheap. I bought mine from RS Components.
There are others but make sure they are fully on at 5v on the gate.
Wawa:
OP has started yet another thread about his 12volt/100Amp motor.
Just get a MIC4421, a MIC4422, and two of those 240A mosfets.
Those drivers ICs take 5volt PWM, and change it into whatever voltage you supply the driver with.
12volt in this case.
Leo..
You are right. I found out that my ground wire was broken in the inside.
Without the ground, when Vin was 5v, Vout was arround 5.8v. Now Vout is a nice 12v.
Why do you think that I need the inverting driver? (mic4421)
And yeah, I need a mosfet with very low RDSon, no simple logic level mosfet can do that.
Beurnii:
You are right. I found out that my ground wire was broken in the inside.
Without the ground, when Vin was 5v, Vout was arround 5.8v. Now Vout is a nice 12v.
Why do you think that I need the inverting driver? (mic4421)
And yeah, I need a mosfet with very low RDSon, no simple logic level mosfet can do that.
Thanks!
Bernard
Sorry, absent minded.
Was thinking H-bridge, but you need a set of P-channel fets for that as well.
All in your previous posts.
I still think it's easier to grab a factory made driver module for that kind of power.
Two 100A H-bridges, fully protected, etc.
In the end cheaper as well.
Leo..