I'm using a DAC to generate a 16-bit voltage supply, using a current buffer (unity gain amp) to enable high current draw and protect the DAC output, and then sensing the current delivered to a load using a current sense amp. Please see schematic.
With an open circuit load (should draw no current) the buffer seems to be pulling a lot of current (the solder job is fine, tested on multiple boards).
Is there something wrong with performing the current sensing operation the way I'm doing it? i.e. is there something wrong with this circuit that I'm not understanding?
Some useful information
- buffers I'm using are unity gain stable