The feedback circuit responds to {HEAD ~ the sensing circuit} to generate a first input signal that is indicative of {TAIL ~ the desired level} of current through the load 
The feedback circuit responds to { HEAD ~ the sensing circuit } to generate a first input signal that is indicative of { TAIL ~ the desired level } of current through the load
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH