STEVAL-ILL035V1
Multi-channel LED driver with integrated boost controller for medium,
large LCD panel backlight based on LED7708 and STM32F103C6T6A
Data brief
Features
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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
STEVAL-ILL035V1
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.).
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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.
June 2012
Doc ID 023200 Rev 1
1/6
www.st.com
6
For further information contact your local STMicroelectronics sales office.
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