Design of power LED lighting driving integrated circuit based on low feedback resistor technique

The power consumption of feedback network was proportional to the feedback resistance under constant current for switch power chips. To increase system efficiency, low feedback resistor technique was put forward in this paper. The bottleneck of low feedback resistor technique was to generate an ultra-low reference voltage to amplify the error with feedback sample voltage. A voltage reference as low as 18 mV was designed. A chip based on bipolar, complementary metal-oxide-semiconductor, double-diffused-mos (BCD) 1.6μm process was designed for the power LED lighting driving system to verify the low feedback resistor technique. The simulation result showed that the system efficiency reached 95.6% and the ripples were (2.14%)/V.