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STMicroelectronics STEVAL-LLL008V1 is a high-efficiency, low THD, dimmable LED Driver Reference Design based on the HVLED001B LED Controller, HVLED002 High Power Factor Flyback Controller, and the SPSGRFC Programmable Transceiver Module. The STEVAL-LLL008V1 Reference Design is designed to demonstrate a dual-stage LED driver circuit for 100W LED lighting applications using 6LoWPAN Mesh networking.
The front-end flyback converter provides high power factor, low THD, and implements CV Primary Side Regulation (PSR) with input from an auxiliary winding on the transformer through the ZCD pin on the HVLED001B controller, so no isolated optocoupler is required. The flyback converter can deliver 105W with an average 79V output voltage and 1.8V maximum ripple.
The converter output supplies an inverse buck stage that delivers a regulated 1.4A current to the LED driver load. The secondary transformer is also able to supply the voltage needed to power up the HVLED002 controller, which manages the inverse buck circuit to provide current limitation for dimming and On/Off control.
The STEVAL-LLL008V1 integrates an STM32L071KZ Microcontroller, which is able to receive remote on, off, and dimming commands via an embedded SPSGRFC sub-1GHz transceiver module. The connectivity functionality can be extended to multiple lighting nodes in a 6LowPAN mesh network.
A Data Concentrator Unit (DCU) and mobile Android application have been developed to help users explore the STEVAL-LLL008V1 Reference Design further. The DCU consists of a NUCLEO-F401RE development platform, plus the X-NUCLEO-IDS01A4 for sub-1GHz communication with the LED Driver Board, and an X-NUCLEO-IDB05A2 Board for Bluetooth communication with a mobile device.
The ST 6LoWPAN Smart Streetlight Mobile App (available on Google Play store) collects lighting nodes represented by the microcontroller and RF module on the Reference Design in a 6LoWPAN mesh network.
