In this thesis, the LED driver circuit had been studied to implement an intelligent LED lamp. The AC voltage from 90~265 V can’t be directly used for LED. So, the flyback-synchro topology was used to transfer ac source to Dc power source. Further, a constant current was employed in LED application due to its nonlinear I-V curve. Also, the FPPA microprocessor was used to accomplish an intelligent lamp, which can auto-adjust the brightness of LED-lamp via optical sensors.