Post History
Although the voltage drop across the current-sensing resistor R6 is floating and it can "move" between the 28 V rails, the A1A op-amp input voltages can (have to) vary within the 5 V power supply. ...
Answer
#3: Post edited
by
Circuit fantasist
·
2020-11-07T12:45:26Z (about 4 years ago)
Minor edit
#2: Post edited
by
Circuit fantasist
·
2020-11-07T12:42:58Z (about 4 years ago)
Another problem
#1: Initial revision
by
Circuit fantasist
·
2020-11-07T11:58:00Z (about 4 years ago)
Although the voltage drop across the current-sensing resistor R6 is floating and it can "move" between the 28 V rails, the A1A op-amp input voltages can (have to) vary within the 5 V power supply. So, you can protect the op-amp (and the whole circuit) against any overvoltages by connecting a bidirectional TVS diode between each input and ground. The only problem of this obvious solution can be the diode leakages.