This wireless module allows for extended connectivity, enabling control of multiple lighting nodes within a 6LowPAN mesh network.
LED street and zone lighting applications demand power supplies that are not only robust and highly efficient but also capable of delivering tightly regulated output currents and voltages. To ensure energy efficiency and compliance with modern standards, these power supplies must exhibit a high power factor (PF), low total harmonic distortion (THD), and minimal voltage ripple. In the realm of smart outdoor lighting, sub-1 GHz wireless connectivity is a popular choice for reliable communication over long distances.
Addressing these needs, the SL-LLL008V1 solution from ST Microelectronics combines a high-efficiency power architecture with integrated wireless connectivity. The power supply is designed using a dual-stage approach. The front-end AC/DC converter is a high power factor flyback stage built around the STF23N80K5 N-channel MOSFET and controlled by the HVLED001B LED driver. This configuration ensures excellent power factor correction, low harmonic distortion, and constant voltage regulation using primary-side feedback, eliminating the need for optocouplers.
The second power stage features an inverse buck converter using the STL4N10F7 MOSFET, driven by the HVLED002 controller. This stage translates external dimming commands into precise current control, enabling dynamic light intensity adjustments. Digital control is handled by the ultra-low-power STM32L071KZ microcontroller, which supports remote commands such as ON/OFF and dimming via the integrated SPSGRFC sub-1 GHz transceiver module.
The solution is complemented by the ST 6LowPAN Smart Streetlight mobile app, which allows users to control lighting functions—including ON/OFF and brightness adjustment—of all connected nodes through a Data Concentrator Unit (DCU) using Bluetooth.
Key components in this system include the HVLED001B controller, which uses advanced peak current mode control for HPF flyback topologies. Its high-voltage startup and monitoring capabilities reduce external component count. The STF23N80K5 MOSFET, built on MDmesh™ K5 technology, offers low on-resistance and ultra-low gate charge for superior efficiency. Meanwhile, the HVLED002 ensures stable current-mode LED driving, and the STL4N10F7 STripFET™ F7 MOSFET enhances switching speed and reduces power losses.Overall, the SL-LLL008V1 is a high-performance smart lighting solution that offers efficiency, scalability, and wireless control, making it ideal for modern, connected street lighting systems.
ST Mircoelectronics has tested this reference design. It comes with a bill of materials (BOM), schematics, assembly drawing, printed circuit board (PCB) layout, and more. The company’s website has additional data about the reference design. To read more about this reference design, click here.
