containsmachine

LCD panel backlight demonstration board based on LED7707

STEVAL-ILL021V1

Overview

This demonstration boards is based on the LED7707 and implements a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LEDs arrays used in the backlight of LCD panels.

The device can manage an output voltage up to 36 V (i.e. ten white-LEDs per row).
The generators can be externally programmed to sink up to 85 mA and can be dimmed via a PWM signal (1% of minimum dimming duty cycle at 1kHz can be managed).
The device allows to detect and manage the open and shorted LED faults and to let unused rows floating.
Basic protections (output overvoltage, internal MOSFET overcurrent and thermal shutdown) are provided.

Main features

Features boost section4.5 V to 36 V input voltage rangeinternal power MOSFETinternal +5 V LDO for device supplyup to 36 V output voltageconstant frequency peak current-mode control250 kHz to 1 MHz adjustable switching frequencyexternal sync for multi-device applicationpulse-skip power saving mode at light loadprogrammable soft-startprogrammable OVP protectionsingle ceramic output capacitornon-latched thermal shutdown
RoHS compliant
Features backlight driver sectionsix rows with 85 mA maximum current capability (adjustable)up to 10 white LEDs per rowrows disable optionless than 10 μs minimum dimming time±2.0% current matching between rowsLED failure (open and short circuit) detection

Design Files

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