iW3989 Digital AC Direct Power Controller for Phase-Cut Dimmable LED Luminaires 1 Description The iW3989 is a high performance AC direct power controller for dimmable LED luminaires. It applies advanced digital control technology to detect the dimmer type, enabling it to provide dynamic impedance to interface with the dimmer and to control the LED brightness at the same time. With advanced dimmer detection technology, the iW3989 can operate with most wall dimmers including leading-edge dimmers (R-type or R-L type), trailing-edge dimmers (R-C type), and smart dimmers. In addition, the iW3989s cycle-by-cycle waveform analysis technology allows for fast dimmer transient response. The iW3989 achieves excellent closed-loop LED current regulation under different AC line and LED forward voltages. It provides high efficiency that is close to switch-mode controllers, which solves the thermal challenges in most AC direct driven luminaires. By eliminating the inductive components, the iW3989 eliminates the audible noise when working with TRIAC dimmers, enabling a true incandescent-like lighting experience. The iW3989 also uses proprietary digital technology to enhance the immunity to line distortion, makes it a robust, flicker-free solution in harsh AC line environments. The iW3989 minimizes the external components count by simplifying the EMI design with Dialogs EZ-EMI technology, and by integrating the LED current sink and V charging circuit. CC 2 Features No external V charging needed - reduces BOM cost Non-isolated off-line 120V LED driver CC AC Excellent immunity to AC line distortion Wide AC line frequency range (from 45Hz to 66Hz) Tight LED current regulation High power factor > 0.7 or > 0.9 Fast start-up (< 0.5s without dimmer) Excellent dimmer compatibility Multiple protection features: x Leading-edge dimmer x LED open-circuit and short-circuit x Trailing-edge dimmer x Current setting resistor open-circuit and short-circuit x Digital smart dimmer x Over-temperature derating and thermal shutdown Wide dimming range 3 Applications Dimmable LED retrofit lamps up to 15W (Note 1) Dimmable LED Luminaires up to 15W (Note 1) 25-Jun-2020 Product Summary Rev. 1.2 www.dialog-semiconductor.com 1 of 6 2020 Dialog SemiconductoriW3989 Digital AC Direct Power Controller for Phase-Cut Dimmable LED Luminaires L LED+ 4 3 2 1 N D D D D U1 LED- iW3989 5 12 V GND G 6 11 V V IN CC V I V V D SET DD S 7 8 9 10 Figure 3.1 : iW3989 Typical Application Circuit Note 1: For output power above 10W designs, care should be taken to verify the thermal and reliability constrains on the IC. IC temperature below 120C is recommended for proper IC operation. 25-Jun-2020 Product Summary Rev. 1.2 www.dialog-semiconductor.com 2 of 6 2020 Dialog Semiconductor