LED downlight design features sophisticated dimming and color management over Bluetooth

Power Integrations offers a new reference design, DER-612, describing a CV, CC 12W isolated flyback power supply with power factor correction for smart lighting applications. The design includes a 3.3V power supply to drive a Casambi CBM-001 Bluetooth wireless module, which provides convenient dimming and color management control of the four-string LED load from 0mA to 400mA. The power supply operates over a universal input voltage range of 90VAC to 265VAC and achieves greater than 0.8 power factor across all line conditions. The design is based on the company’s InnoSwitch-CH power supply controller, which combines primary, secondary and feedback circuits in a single surface-mounted offline flyback switcher IC. The IC incorporates the primary FET, the primary-side controller and a secondary-side synchronous rectification controller. The device also includes Power Integrations’ magneto-coupling communications technology, FluxLink, which safely bridges the isolation barrier and eliminates the need for an optocoupler. Secondary-side control enables highly accurate constant-voltage regulation and an ultra-fast step load response while simple PWM control eliminates the need for a secondary DC-DC regulator. The high efficiency and very low standby power of the IC eliminates the need for additional heatsinks and enables customers to create solutions that meet demanding DOE-6 regulations. A built-in secondary-side auxiliary power output supports RF and MCU control circuitry. Comments Hubie Notohamiprodjo, director of product marketing for LED lighting at Power Integrations: “Smart lighting systems monitor and control sophisticated home and workplace lighting installations. The standby power needed for the control subsystem often negates any savings that high efficiency LEDs offer. Casambi’s low quiescent current draw combined with the very low standby consumption of InnoSwich-CH optimizes standby performance while maintaining instant light availability.” Adds Timo Pakkala, CEO and co-founder at Casambi: “The Power Integrations InnoSwitch-CH power supply controller has excellent efficiency, particularly at light load. This allows our module to operate continuously and effectively, resulting in a great user experience with high performance and scalability.”