The controller comprises a comparator and a current sense resistor for comparing {HEAD ~ a reference voltage} with {TAIL ~ a current sense voltage} developed across the current sense resistor by the switch current flows 
The controller comprises a comparator and a current sense resistor for comparing { HEAD ~ a reference voltage } with { TAIL ~ a current sense voltage } developed across the current sense resistor by the switch current flows
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH