iW3623

iW3623 AC/DC Digital Power Controller for High Power Factor Off-Line LED Drivers 1.0 Features ●● Isolated AC/DC off-line LED driver ●● Power factor > 0.95 for wide input voltage range 100 – 277VAC ●● Total harmonic distortion (THD) < 10% ●● Under 5% 100Hz/120Hz output current ripple ●● Resonant control to achieve high efficiency ●● LED current foldback with external NTC ●● Small size design xx Small size input bulk capacitor xx Small size output capacitor xx Small transformer ●● Primary-side sensing eliminates the need for opto-isolator feedback and simplifies design ●● Tight LED current regulation ± 5% ●● Under 0.5 second start-up time ●● Hot-plug LED module support ●● Multiple protection features: xx LED open circuit protection xx Single-fault protection xx Over-current protection xx LED short-circuit protection xx Current sense-resistor-short-circuit protection xx Input over-voltage and brown-out protection 2.0 Description The iW3623 is a high-performance AC/DC off-line power supply controller for LED luminaires. The iW3623 combines power factor correction and LED current regulation into one controller. It achieves PF > 0.95 and THD < 10% for 100– 277VAC input voltage range. The iW3623 operates in quasi-resonant mode to provide high efficiency. The device uses iWatt’s advanced primaryside sensing technology to achieve excellent line and load regulation without secondary-feedback circuit. In addition, the iW3623’s pulse-by-pulse waveform analysis technology allows accurate...