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| ST LED7706 LCD背景光驱动方案 | |||||
作者：ST 文章来源：ST 点击数： 更新时间：2008-4-14  |
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6-rows 30 mA LEDs driver with boost regulator for LCD panels backlight The LED7706 consists of a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LED arrays used in the backlighting of LCD panels. The device can manage an output voltage up to 36 V (i.e. 10 white LEDs per row). The generators can be externally programmed to sink up to 30mA and can be dimmed via a PWM signal (1 % dimming duty-cycle at 20 kHz 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 Over-Voltage, internal MOSFET Over-Current and Thermal Shutdown) are provided. 主要特性： Boost section 4.5 V to 36 V input voltage range Internal power MOSFET Internal +5 V LDO for device supply Up to 36 V output voltage Constant frequency peak current-mode control 250 kHz to 1 MHz adjustable switching frequency External synchronization for multi-device application Pulse-skip power saving mode at light load Programmable soft-start Programmable OVP protection Stable with ceramic output capacitors Thermal shutdown Backlight driver section Six rows with 30 mA maximum current capability (adjustable) Parallelable rows for higher current Rows disable option Less than 500 ns minimum dimming time (1 % minimum dimming duty-cycle at 20 kHz) ±2 % current matching between rows LED failure (open and short-circuit) detection 应用： LCD monitors and TV panels PDA panel backlight GPS panel backlight  图1. LED7706方框图  图2. LED7706应用电路 |
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