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200 W, digital 4-LED channels demonstration board with STLUX385A-controlled current regulation and dimming

The STEVAL385LED4CH demonstration board is a complete and configurable solution to manage four independent high-brightness LED channels using the STLUX385A digital controller. The STLUX385A is a part of the STMicroelectronics®STLUX™ product family and embeds advanced peripherals tailored to generate high resolution PWM signals (SMED).

The STEVAL385LED4CH device implements inversed buck topology to drive each LED channel. The SMED technology integrated in the STLUX385A device regulates the LED current, exploiting the fixed-off-time (FOT) principle. Each channel can output current in the range of 250 mA to 1 A.

The number of LEDs, the current and the PWM dimming working point can be set through the command interpreter, accessible via the serial interface. Dimming can also be manually adjusted via the three on-board buttons.

The demonstration board can be optionally controlled via a DALI interface. The DALI connection board is available separately (part number STEVAL-ILM001V1). The STLUX385A DALI software drivers and application firmware are available.

This demonstration board is available also with an order code STEVAL-ILL057V1.

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Errata Sheet
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Data Brief

Key Features

  • Based on the STLUX385A digital controller
  • Up to 200 W
  • 4 LED channels
  • Adjustable LED current and dimming
  • Adaptive voltage compensation
  • Real-time fault detection and protection (e.g: short or open circuit)
  • Serial interface
  • DALI (optional)

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1921: 200 W, digital 4-LED channels demonstration board with STLUX385A-controlled current regulation and dimming
2.0 499 KB

Application Notes

Description Version Size
AN4291: STEVAL385LED4CH: four independent high brightness LED channels using the STLUX385A digital controller
1.0 2,276 KB

Hardware Resources

Bill of Materials

Description Version Size
1.0 114 KB

Schematic Pack

Description Version Size
STEVAL385LED4CH schematic
1.0 156 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL385LED4CHNRNDSTLUX385A-No availability reported, please contact our Sales officeNot compliant-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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