I want to switch 2 hydraulic valves at the same time.
The valves using 30V and about 3A.
I'm using a Mosfet from Adafruit
for switching a Profet from Infineon
The problem is, that if I'm switching the Profet OFF, the voltage only
drops from 30V to about 28,8V not to 0.
So I added a pulldown-resistor at the output of the Profet, but I'm not
sure about the right amount of Ohm.
If I'm adding a 10k pulldown-resitor I'm getting 0,162V
4,7k pulldown = 0,074V
2,2k pulldown = 0,035V
So my questions are:
x why do I need a pulldown-resistor in this case? (I know why I normally
use one, but if I think about switching off a normal mosfet, voltage is
x and what is the right amount of Ohm for the resistor for switching
the 3A valves??
I have attached a small graphic of my circuit. Pins 1,2,6,7 of the
Profet need to be shorted according to the datasheet.
thanks in advance