A comparator circuit outputs a signal corresponding to {HEAD ~ a difference} between {TAIL ~ a control voltage} output from one of the synchronous rectifier circuits and a reference voltage 
between
A comparator circuit outputs a signal corresponding to { HEAD ~ a difference } between { TAIL ~ a control voltage } output from one of the synchronous rectifier circuits and a reference voltage
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH