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STMicroelectronics LED7708 | Demoboard STEVAL-ILL035V1

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

Overview

TopologyBoost Converter
Input voltage10-28 V
IC revision1

Description

The purpose of the STEVAL-ILL035V1demonstration 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 LEDdriver with integrated boost controller (theLED7708), power section components, and anSTM32 microcontroller to easily control all thefeatures via a USB connection.The output voltage required by the LED stringsconnected 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 andmanagement 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.).

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 currentcapability and independent PWM brightnesscontrol
  • Up to 15 white LEDs per channel
  • On-board STM32 microcontroller for totaldevice control through 4-wire serial interface
  • Embedded open-channel and LED short-circuit faults management
  • USB connection for device control throughdedicated PC-GUI
  • Expansion connector to support slave devices(daughterboard)
  • RoHS compliant

Products

Order Code Data­sheet Downloads Product seriesApplicationInterface TypeMountIR
(A)
Working Voltage
(V (AC))
H
(mm)
Operation Force
(g)
Actuator ColorPinsRowsGenderTypeIR
(A)
Packaging Samples
65100516121SPEC
6 files WR-COM Mini USB 2.0 Type B SMT Horizontal 5 Contacts Mini USB Type B SMT 30 5 Receptacle Horizontal 1 Tape and Reel & Mylar
430453031836SPEC
5 files WS-TASV J-Bend SMT Washable Tact Switch 6x6 mm 3.1 360 Salmon 0.05 Tape and Reel
434123025816SPEC
5 files WS-TASV J-Bend SMT Tact Switch 6.0x3.8 mm 2.5 160 Black 0.05 Tape and Reel
623310235321SPEC
6 files WR-PHD 1.27 mm SMT Dual Socket Header Bottom Entry, H=2.20 mm (Reel) SMT 1 100 10 Dual Socket Header Bottom Entry 1 Tape and Reel with Pad
Samples
Order Code Data­sheet Downloads Product seriesApplicationInterface TypeMountIR
(A)
Working Voltage
(V (AC))
H
(mm)
Operation Force
(g)
Actuator ColorPinsRowsGenderTypeIR
(A)
Packaging Samples