The control circuit comprises a plurality of current control stages, {HEAD ~ a minimum circuit}, a sensing circuit, and {TAIL ~ a feedback circuit} 
The control circuit comprises a plurality of current control stages , { HEAD ~ a minimum circuit } , a sensing circuit , and { TAIL ~ a feedback circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL