D
David Knaack
- Jan 1, 1970
- 0
Greetings,
I want to use a MAX472 to measure the current flow to and from an car
battery, excluding the starter motor. I don't think I'll see current
peaks of more than 120A, and probably rarely over 50A. About 12-15vdc.
The MAX471/472 datasheet gives some typical configurations
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1108/ln/en link to
datasheet near top right corner), but only up to 10A.
I'm not confident that I understand how to calculate the values of the
three resistors (Current-sense, gain and output). I think that I'll
need about 0.5 milliohm for the current sense, but I don't really
understand the other ones.
I wonder if someone could point me in the right direction here. I'd
like to know how to calculate the right values since I'll probably need
to adjust them later (after I have a better idea of what the actual
current will be).
Thanks
DK
I want to use a MAX472 to measure the current flow to and from an car
battery, excluding the starter motor. I don't think I'll see current
peaks of more than 120A, and probably rarely over 50A. About 12-15vdc.
The MAX471/472 datasheet gives some typical configurations
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1108/ln/en link to
datasheet near top right corner), but only up to 10A.
I'm not confident that I understand how to calculate the values of the
three resistors (Current-sense, gain and output). I think that I'll
need about 0.5 milliohm for the current sense, but I don't really
understand the other ones.
I wonder if someone could point me in the right direction here. I'd
like to know how to calculate the right values since I'll probably need
to adjust them later (after I have a better idea of what the actual
current will be).
Thanks
DK
