A simple LED lamp driver IC with intelligent power-factor correction

The paper presents a LED lamp driver IC with intelligent power factor correction. The proposed LED driver can operate at the universal input range from 50 VAC to 320 VAC at 60 Hz AC mode and up to 450 VDC at DC mode. The test circuit uses 5.5 mH inductor, variable number of LEDs from 5 to 16 (2.5 to 7W LED load) and 1 μF MLCC capacitor. Since, the proposed LED driver follows the peak current control method, the peak current level is almost constant against the different AC voltage and the number of LEDs. The proposed LED driver was assembled in an SOT-223 package.