My 339 datasheet says comparators in general have a tendency to oscillate due to stray capacitance. I'm assuming that would be at or near the threshold of the switching point and since I'll be watching the discharge rate of a battery bank with a 339 I would expect to be in that area for considerable lengths of time. 2mv sensitivity sounds a little touchy.
The fix suggested in the Applications Hints section is a positive feedback resistor that develops 1-10mv.
My V+ input to gnd is 4 to 5K depending on how much I need to get above the zener on my Vref. In order to develop an additional 10 mv I'll need roughly 2uA from the 12v on the output of comparator. 12v/2uA is 6 megs and I've never seen a resistor that large!
No one will be more surprised than me if I've got this right. Something tells me I don't ....
SP
The fix suggested in the Applications Hints section is a positive feedback resistor that develops 1-10mv.
My V+ input to gnd is 4 to 5K depending on how much I need to get above the zener on my Vref. In order to develop an additional 10 mv I'll need roughly 2uA from the 12v on the output of comparator. 12v/2uA is 6 megs and I've never seen a resistor that large!
No one will be more surprised than me if I've got this right. Something tells me I don't ....
SP