Patent ID: 8269423

Claim:
A circuit for driving a plurality of light emitting diodes (LEDs), comprising: an input voltage port for providing an input voltage to said circuit; an output voltage port for providing an output voltage to said plurality of LEDs; a high side switch having a first terminal electrically coupled to said input voltage port; a low side switch having a first terminal electrically coupled in series to a second terminal of said high side switch such that said high side switch and said low side switch form a node, a second terminal of said low side switch being electrically coupled to ground; an inductor electrically coupled between said node and said output voltage port; a capacitor having a first terminal electrically coupled to said output voltage port; a resistor having a first terminal and a second terminal electrically coupled to ground, the first terminal of the resistor being electrically coupled to a second terminal of said capacitor; and control circuitry for receiving (1) a sensing voltage across said resistor and (2) a reference voltage and deriving a first control signal to control said high side switch and a second control signal to control said low side switch, wherein said control circuitry receives said input voltage as a first feed forward voltage and said output voltage as a second feed forward voltage, and wherein said control circuitry is configured to achieve a generally fixed frequency.