Moreover the boost converter comprises a first capacitive means connected between output ports of the boost converter, said power switch connected between the node LX and VSS voltage, wherein the power switch is controlled by output signals of a PWM control unit, and said PWM control units receiving inputs from a clock signal generator and from a voltage level from {HEAD ~ a node}, connected between a second terminal of a programmable current source and {TAIL ~ a second terminal} of one or more white LEDs connected in series 
Moreover the boost converter comprises a first capacitive means connected between output ports of the boost converter , said power switch connected between the node LX and VSS voltage , wherein the power switch is controlled by output signals of a PWM control unit , and said PWM control units receiving inputs from a clock signal generator and from a voltage level from { HEAD ~ a node } , connected between a second terminal of a programmable current source and { TAIL ~ a second terminal } of one or more white LEDs connected in series
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH