Due　to　the　enormous　progress　recently　achieved　in　the　technology　of　light　emitting　diodes　(LEDs),　they　are　expected　to　replace　conventional　lamps　in　automotive　applications　in　the　near　future　and　incandescent,　halogen　and　fluorescent　lamps　at　least　in　some　general　illumination　applications　within　a　few　years.　Innovative　driver　circuits　optimized　with　respect　to　functionality,　efficiency,　cost,　size　and　reliability　are　an　enabler　for　the　successful　introduction　of　new　LED　based　lighting　products.　A　low　ripple　and　high　efficiency　single-stage　power　driver　is　proposed　for　LED　lighting　in　this　paper.　The　proposed　single-stage　power　driver　integrated　a　step-down　Cuk　rectifier　for　power-factor　correction　(PFC)　with　the　isolated　flyback　converter　for　DC-DC　power　conversion.　In　the　proposed　single-stage　stepdown　Cuk　rectifier　achieve　low　input　ripple　and　output　ripple　and　lower　switch　stress,　and　reduce　the　two　energy　conversion　stages　to　improve　the　driver　efficiency.　The　analysis　of　the　proposed　converter　is　presented　and　experimental　results　based　on　0.75A,　30　W　prototype　are　provided　to　demonstrate　the　performance　of　the　proposed　driver.