Description

The ALED7707 device consists of an automotive

grade (AEC Q100 compliant) 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 85 mA and can be dimmed via a PWM

signal (1 dimming duty cycle at 1 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

overvoltage, internal MOSFET overcurrent and

thermal shutdown) are provided.

Features

• AEC-Q100 qualification

• 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 85 mA maximum current

capability (adjustable)

– Rows disable option

– Less than 10 μs minimum dimming on-time

– ± 3 current matching between rows

– LED failure (open and short-circuit)

detection

Applications

• Infotainment LCD backlight

• Daytime running lights

• Car interior/exterior lights

• Dashboard backlight

ALED7707属于集成电路（IC） > LED 驱动器。意法半导体（ST）集团制造生产的ALED7707LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。