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