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