a resistor connected to {HEAD ~ the current feedback input} of {TAIL ~ the PWM generator} and current compensation IC, the electronic switch and ground 
of
a resistor connected to { HEAD ~ the current feedback input } of { TAIL ~ the PWM generator } and current compensation IC , the electronic switch and ground
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH