ST Life.augmented

Digital Power Control Drivers

STLUXTM turns on your innovative ideas

STLUXTM digital controllers are the world’s first programmable controllers specifically optimized for lighting applications.

The innovative SMED (state machine, event-driven) digital technology and the integrated microcontroller make STLUXTM easily programmable and versatile. It can be configured with application-specific algorithms to optimize the overall system efficiency, enabling high-performance and cost-effective lighting design.

SMED is a hardware state machine triggered by internal or external events. In power-supply applications, for example, a SMED can close the regulation loop and automatically switch off the circuit when it detects an overcurrent or a short circuit, so protecting the circuit. Since SMEDs are embedded, they guarantee an event reaction time shorter than that provided by standard interrupt-driven microprocessors.

The first member of the family, STLUX385A, also integrates DALI (digital addressable lighting interface) for remote control and monitoring.

Features and benefits

  • 6 SMED-controlled PWMs providing full control of any power conversion stage
  • Integrated DALI enabling control, communication and monitoring functions
  • Integrated digital core making STLUX easy to use and programmable
  • New customizable and load-tailored algorithms ensuring very high efficiency
  • Fault detector improving reliability
  • Single-chip solution saving space when compared to discrete solutions

100 W LED lighting solution based on STLUX385A digital controller

Digital control is the key to maximizing the efficiency of high-power applications, like smart street and high-bay lighting.

In the STEVAL-ILL066V1 solution, STLUX385A 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.

The high-precision dimming is controlled using a primary-side regulation (PSR) control technique.

LED efficiency is high during all steps of dimming and the solution can achieve a 92% efficiency during full load while maintaining a low power consumption, <200 mW, during idle periods.

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®.