asicpark
Member level 1
over current detector circuit
Hi All,
I am going to desgin the over current detection circuit to diable the drive funtion when the current goes over some limit(maybe 2~300mA).
It should be needed low operating current and quite precise level.
For now, I am thinking some circuit using sense element with metal resistor in power line. The each side of voltage across the metal resistor are each input of a comparator. But, I think it might be only tens of mili volt (40mohm*300mA), so I wonder it would be fine to detect the level.
If someone who have an idea for this, please let me know.
P.S. I also need 2u current bias to operate under 1.2V.
Thanks,
Hi All,
I am going to desgin the over current detection circuit to diable the drive funtion when the current goes over some limit(maybe 2~300mA).
It should be needed low operating current and quite precise level.
For now, I am thinking some circuit using sense element with metal resistor in power line. The each side of voltage across the metal resistor are each input of a comparator. But, I think it might be only tens of mili volt (40mohm*300mA), so I wonder it would be fine to detect the level.
If someone who have an idea for this, please let me know.
P.S. I also need 2u current bias to operate under 1.2V.
Thanks,