Moreover the boost converter comprises a first capacitive means connected between {TAIL ~ 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 a second terminal of one or more white LEDs connected in series 
Moreover the boost converter comprises a first capacitive means connected between { TAIL ~ 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 a second terminal of one or more white LEDs connected in series
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