I'm trying to control a 12V piezo pump (with an inbuilt driver) and I'm a bit unsure how to use it safely. I'm using an Arduino Uno to control it, with an N-channel MOSFET rated at 60V 30A (with a 10K pull down resistor). I'm powering the piezo pump with a 12V 5A power supply. Looking at the data sheet for the pump, I noticed that it amplifies the signal from 12V to 250V (but doesn't draw very much amperage... about 40mA I believe).
Will the 250V be contained within the piezo pump and not ruin anything? Or do I need a more powerful transistor? I was told it would be a good idea to place a fuse in the circuit, but I didn't really get where it should go. Or which one to use.
I know when you use a motor with a MOSFET, a diode should be used to prevent a voltage spike from coming back and frying the MOSFET, is this the same for high voltage piezos?
The whole 250V amplification thing has me a bit concerned and I'd like some advice before proceeding. So, please let me know if I should be using a higher rated transistor, a diode and/or a fuse. Don't hesitate to let me know I'm missing anything either.