Digital power controller aims to accelerate street-light conversions
Based on ST’s STLUX385A digital power controller, the street-lighting plug-and-play design highlights the device’s ability to optimize LED efficiency at any dimming level and minimize power in idle conditions.
“Digitally controlled lighting is the key to saving energy in outdoor installations,” said Matteo Lo Presti, Group Vice President and General Manager, Industrial and Power Conversion Division, STMicroelectronics. “ST’s new solution for LED street lighting packs 25 years of experience in power conversion into a single, future-proof platform; as grids get progressively smarter, cities will be able to control the streetlamps to produce even greater savings because all the key communications protocols are already incorporated in the STLUX385A.”
The reference design includes full schematics, bill of materials and firmware, enabling customers to rapidly develop digital power controllers for 100W LED lamps using ST’s unique STLUX385A, the world’s first universal digital controller for lighting and power-conversion applications. In this solution, the STLUX385A device handles a primary-side regulated power-conversion stage, as well as all the supported communication links. The power-conversion stage consists of a PFC regulator followed by a Zero Voltage Switching (ZVS) LC-resonant stage. High-precision dimming is controlled using a primary-side regulation (PSR) control technique.
The demonstration board provides all the key physical-communication interfaces such as DALI (Digital Addressable Lighting Interface), insulated 0-10 and UART, with all the communication managed by the STLUX385A device. The flexibility of the STLUX385A also allows the board to be easily connected to other interfaces such as Wi-Fi, power-line modems, Bluetooth and ZigBee.
The demonstration board is available now at $140 with order code STEVAL385LEDPSR.
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