iW3623 Datasheet | iWatt

i W3623 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 i W3623 is a high-performance AC/DC off-line power supply controller for LED luminaires. The i W3623 bines 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 i W3623 operates in quasi-resonant mode to provide high efficiency. The device uses i Watt’s advanced primaryside sensing technology to achieve excellent line and load regulation without secondary-feedback circuit. In addition, the i W3623’s pulse-by-pulse waveform analysis technology allows accurate LED current regulation. The i W3623 maintains stability over all operating conditions without the need for loop pensation ponents. 3.0 Applications - - Non-dimmable LED lamps and luminaires - - Optimized for up to 40W output power Rev. 0.8 i W3623 Preliminary September 10, 2012 Page 1 i W3623 AC/DC Digital Power Controller for High Power Factor Off-Line LED Drivers Booster Converter AC Input Flyback Converter VOUT 4...