Arduino pwm fet driver#

I wonder if your MOSFET is shorted from Gate to Source (I'm not sure how a MOSFET fails when it is hit with more voltage than it can handle across it's Drain to Source channel (when it's turned off) but maybe the Gate to Source shorts out )īTW: even at 7.8kHz, the Arduino output should have no problem driving a MOSFET like this. That waveform looks like inductance, which is odd. If you disconnect everything from the Arduino pin, what does the waveform look like (on that pin) - is it nice and square? Looking at the photo of your scope, I see a period of 128.0µS and a frequency of 7.8231kHz (which is close to the inverse of 128µS), so either this is some sort of unrelated noise, or the PWM frequency is more like 7.8kHz. (however I am using a Nano instead of an Uno which shouldn't make a difference)įirst thing I notice is: 60V - also, is that plus AND minus 60V, or just +60V and 0V? Either way, it exceeds the MAX V DSS of the MOSFET (which is rated at 55V).

Will this just be a fun little project, or is this destined for production?.

What sort of duty cycle (in other words, will the motor be on for extended periods, or only brief periods, or some random/chaotic intermittence? Will this be a highly predictable duty cycle, or can some incongruence be expected?.

Will this need to be powered via a battery, or some external mains-based supply, or ?.

Arduino pwm fet driver#

charge/discharge the Gate capacitance rapidly enough - the more current that needs to be switched, the greater the gate capacitance tends to be, and at higher PWM frequencies, you might need a gate driver to do the job. What PWM frequency? This will have an impact on whether or not an Arduino output can directly drive the MOSFET [i.e.What Kind of maximum current can we expect (or, how about a description of the actual application)? What voltage do you plan to run it at? [Similar to the question 'what voltage is it rated to run at', but my question spans the scope of intentional abuse D )Ĭ.

Second, we need a bit more information - like:ī. First of all, I think you mean 40mA, not 40mV).