描述 Description

The LED7706 consists of a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LEDs 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 30 mA 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.

特性 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 synchronization for multi-device applicationPulse-skip power saving mode at light loadProgrammable soft-startProgrammable OVP protectionStable with ceramic output capacitorsThermal shutdown
? Backlight driver sectionSix rows with 30 mA maximum current capability (adjustable)Rows disable optionLess than 500 ns minimum dimming ontime (1 % minimum dimming duty-cycle at 20 kHz)±2 % current matching between rowsLED failure (open and short-circuit) detection

簡介

LED7706屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的LED7706LED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進行外部控制，可在照明應(yīng)用中用于實現(xiàn)調(diào)光功能。