{TAIL ~ Input source voltage} supplied to {HEAD ~ the transformer} is also supplied through a start up circuit to drive the pulse width modulator and the main power switch 
{ TAIL ~ Input source voltage } supplied to { HEAD ~ the transformer } is also supplied through a start up circuit to drive the pulse width modulator and the main power switch
TAIL 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 OTH OTH OTH