- Joined Oct 3, 2010
I am trying to come up with a system for pulse-by-pulse current monitoring for my controller. I am considering using a shunt resistor like this (.0005Ω)for each mosfet. For example, if I wanted to limit my current to 50A through the mosfet, this resistor would output 25mV for 50A through it. I would use a comparator to compare this voltage output to a fixed reference voltage (25mV) so that I can shut off the Mosfet in the middle of PWM duty cycle (via the driver enable pin). So I need a super fast comparator that has a very low (1mV?) resolution. I am looking at this one. It is super fast but I can't figure out what the resolution is. it lists Input Offset Voltage @ 1-3mV but I'm not sure if that's the number I should be looking at. I'm just assuming that there's such a thing as a resolution rating; is there? I don't see one here.