I have a Problem turning a MOSFET On/Off with my Arduino. I try to controll multiple mosfets to supply a high power Device with current. Now my issue is that the mosfet does not turn on.
Here is a basic sketch of the circuit for one MOSFET.
I use this mosfet
At this point, I am not sure if the 5V supply Voltage is enough to switch the MOSFET.
The max. VDD is 200V and 1A
I tried adding a Bleed Resistor at 10k Ohm but that didn't really change anything.
The Analyzer is my Supply and measures the Current/Voltage.
simulate this circuit – Schematic created using CircuitLab
The Analyzer is A B1500A
It can measure spot, sweep, sampling and pulse in the range of 0.1fA-1A or 0.5uV-200V
Best Answer
First, you can not use an N-Channel MOSFET like that to high-side switch power to a load. The gate voltage would been to be greater than Vdd when the thing is turned on.
N-Channels are better suited for low-side switching, as shown below.
simulate this circuit – Schematic created using CircuitLab
Second, even if properly configured as a low side switch, that particular device is only guaranteed to start turning on at 4V, which will be marginal with a 5V Arduino, and way too high for a 3.3V model.
If you really need to use high side switching you need to use a two stage switch like this one.
simulate this circuit
However, switching 200V at higher speeds is not that easy.
In all cases you need to include an appropriate gate resistor to limit the current required from the Arduino to switch the MOSFET and to provide a little isolation from voltage spikes.