A light-emitting diode（ LED） driver chip which can achieve high power factor（ PF） and cool and warm color temperature switching is proposed. Circuit of the proposed chip consists of four current channels in order to control a cool light LED string and a warm light LED string outside the ship

and each LED string is divide into four parts. By controlling conduction of each LED through chip

output current is adjusted according to input AC voltage to achieve high power factor. The color temperature status can be output by memory of off-chip capacitor and on-chip digital state machine. So that the color temperature state can be easily switched in sequence by manually switch the power switch. This system has the advantages of small size

long-life and high reliability because no magnetic components and electrolytic capacitor off-chip is used. 1 μm 700 V CMOS process is used by control chip. The simulation results show the lighting application system using proposed driver chip has a power factor of 97. 80 % and an efficiency of 90. 22 %. The color temperature switching function is also verified by the simulation.