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