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STMicroelectronics LED7708 | Demoboard STEVAL-ILL035
Multi-channel LED driver with integrated boost controller for medium, large LCD panel backlight based on LED7708 and STM32F103C6T6A
Overview
| Topology | Boost Converter |
| Input voltage | 12-24 V |
| Switching frequency | 200-1000 kHz |
| Output 1 | 43.4 V / 0.02 A |
| IC revision | 1 |
Description
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.).
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
More information
Products
Order Code | Datasheet | Downloads | Status | Product series | Interface Type | Type | Variant | Gender | Pins | Mount | IR(A) | Working Voltage(V (AC)) | Packaging | L(mm) | Operating Temperature | H(mm) | Operation Force(g) | Electrical Life(Cycles) | Actuator Color | Washable | Vaporphase process | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-USB Mini/Micro Connectors, Mini USB 2.0, Type B | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Mini/Micro Connectors | Interface TypeType B | TypeHorizontal | Variantwith Pads & Pegs | GenderReceptacle | Pins5 | MountSMT | Rated Current1 A | Working Voltage30 V (AC) | PackagingTape and Reel & Mylar | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | |||
 | WS-TASV J-Bend SMT Washable Tact Switch 6x6 mm, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWS-TASV J-Bend SMT Washable Tact Switch 6x6 mm | – | – | – | – | – | – | Rated Current0.05 A | – | PackagingTape and Reel | – | Operating Temperature -40 °C up to +85 °C | Height3.1 mm | Operation Force360 g | Electrical Life200000 Cycles | Actuator ColorSalmon | WashableYes | Vaporphase processnot specified | |||
 | WS-TASV J-Bend SMT Tact Switch 6.0x3.8 mm, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWS-TASV J-Bend SMT Tact Switch 6.0x3.8 mm | – | – | – | – | – | – | Rated Current0.05 A | – | PackagingTape and Reel | – | Operating Temperature -40 °C up to +85 °C | Height2.5 mm | Operation Force160 g | Electrical Life50000 Cycles | Actuator ColorBlack | WashableNo | Vaporphase processnot specified | |||
 | WR-PHD Socket Header, –, – | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Socket Header | – | TypeBottom Entry | – | GenderSocket Header | Pins10 | MountSMT | Rated Current1 A | Working Voltage100 V (AC) | PackagingTape and Reel with Pad | Length6.75 mm | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – |