Multi-channel LED driver with integrated boost controller for medium, large LCD panel backlight based on LED7708 and STM32F103C6T6A

The purpose of the STEVAL-ILL035V1 demonstration board is to provide an application example of a compact LED backlight driver using the LED7708 device.

The board is equipped with a 16-channel LED driver with integrated boost controller (the LED7708), power section components, and an STM32 microcontroller to easily control all the features via a USB connection.

The output voltage required by the LED strings connected to the output channels is derived from a single input rail and continuously adjusted to minimize the voltage drop (and power dissipation) across them, despite an independent PWM duty cycle for each one. The brightness of each LED string is digitally controlled with 12- or 16-bit dimming resolution.

Embedded, programmable fault detection and management circuitry can be set to automatically disconnect faulty channels without the need for intervention by the host controller.

The board has been designed as a demonstration of a solution for medium/large LCD panel backlight drivers, but is suitable for any application involving several LEDs assembled in strings (e.g. advertisement panels, signs, gaming, etc.).

Key Features

  • Wide DC input voltage: 10 V to 28 V
  • Integrated boost converter with adaptive output voltage for minimum power dissipation
  • Up to 92% boost converter efficiency
  • 16 channels with up to 85 mA/ch current capability and independent PWM brightness control
  • Up to 15 white LEDs per channel
  • On-board STM32 microcontroller for total device control through 4-wire serial interface
  • Embedded open-channel and LED short-circuit faults management
  • USB connection for device control through dedicated PC-GUI
  • Expansion connector to support slave devices (daughterboard)
  • RoHS compliant

Image

×

Design

Technical Documentation

Product Specifications
Description Version Size
DB1657 DB1657: Multi-channel LED driver with integrated boost controller for medium, large LCD panel backlight based on LED7708 and STM32F103C6T6A 1.0 251 KB
Application Notes
Description Version Size
AN4578 AN4578: 16-channels LED driver with independent PWM dimming control based on LED7708 2.0 2 MB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
STEVAL-ILL035V1 gerber files 1.0 666 KB
Bill of Materials
Description Version Size
STEVAL-ILL035V1 BOM 2.0 64 KB
Schematic Packs
Description Version Size
STEVAL-ILL035V1 schematics 1.0 97 KB

Legal

License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB

Tools and Software

Embedded Software
Evaluation Tool Software
Support & Community
Featured Products
Related Applications

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-ILL035V1 LED7708; STM32F103C6T6 Active 121.28 1 NEC 3A991A2 ITALY MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
test

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-ILL035V1 ActiveCARDIndustrialEcopack2
test

(**) The Material Declaration forms available on st.com 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.

×