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