Moreover the boost converter comprises a first capacitive means connected between output ports of the boost converter, said {HEAD ~ power switch} connected between {TAIL ~ 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 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 
connected between
Moreover the boost converter comprises a first capacitive means connected between output ports of the boost converter , said { HEAD ~ power switch } connected between { TAIL ~ 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 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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