A new reference design, DER-612, describes a constant-voltage (CV), constant-current (CC) 12-W isolated flyback power supply with power factor correction for smart lighting applications. The design includes a 3.3-V power supply to drive a Casambi CBM-001 Bluetooth wireless module, which provides dimming and color management control of the four-string LED load from 0 to 400 mA. The power supply operates over a universal input voltage range of 90 to 265 Vac and provides greater than 0.8 power factor across all line conditions.
The design is based on Power Integrations’ 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.
CBM-001 is a Class 2 embedded Bluetooth 4.0 module designed for LED lighting control applications, light fixtures and LED bulbs. It is pre-programmed with Casambi’s proprietary firmware, making it completely compatible with other Casambi enabled devices. CBM-001 is controlled wirelessly with Casambi smartphone and tablet applications using the Bluetooth 4.0 protocol. Devices automatically form a self-healing and self-organizing wireless mesh network so that a large number of fixtures can be controlled from any point. No external gateway module is needed.
DER-612 enables simple parallel connection of LED strings for RGBW lighting. It can be downloaded at http://www.power.com/der-612.
