hi, I would like to sense the current from a path where a current of 50mA to 2 A is flowing to the load. Can I use simple differential amp with gain across the Rsense =20mohm or is there any contemporary design help.
thanks
It then depends on if the current shunt is located in the negative or the positive side of the supply, and if positive, how high the dc voltage is.
There are some very nice current shunt amplifiers available from Maxim and Linear Technology, but which one to use depends on the specific application.
thank you for your reply actually I would like to measure load current in a dc-dc buck converter.
sequence is
buck output --Rsense 20m ohm ---load 6 ohm---gnd
It then depends on if the current shunt is located in the negative or the positive side of the supply, and if positive, how high the dc voltage is.
There are some very nice current shunt amplifiers available from Maxim and Linear Technology, but which one to use depends on the specific application.
These are listed as not for new designs, but are still available. The advantage is that they are available in an 8 pin plastic DIP. There are plenty of alternatives but most if not all are in very small surface mount packages.