{TAIL ~ Transformer leakage inductance energy} is applied to drive {HEAD ~ the pulse width modulator} and the main power switch in a run mode after start up 
{ TAIL ~ Transformer leakage inductance energy } is applied to drive { HEAD ~ the pulse width modulator } and the main power switch in a run mode after start up
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH