A8503集成电路（IC）的LED驱动器规格书PDF中文资料

A8503属于集成电路（IC）的LED驱动器。由Allegro MicroSystems制造生产的A8503LED 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。

Description

The A8503 is a multi-output WLED/RGB LED driver for medium-size LCD backlighting. It integrates a current-mode boost converter with internal power switch and six current sinks. The boost converter can provide output voltages up to 47 V. The boost converter can drive up to 72 LEDs at 20 mA per LED with a battery voltage down to 5 V. The LED sinks are capable of sinking up to 32 mA each, and can also be paralleled together to achieve even higher LED currents. The A8503 provides protection against overvoltage, open diode, open or shorted LED string, and overtemperature. A dual level cycle-by-cycle current limit function provides soft start and protects against overloads. A soft start timeout monitor is provided to enhance protection when starting up into a fault condition.

Features and Benefits

▪ Active current sharing between LED strings for ±0.6 accuracy and matching

▪ Drives up to 12 series × 6 parallel = 72 LEDs (Vf = 3.2 V, If = 20 mA) at 5 V

▫ Each individual current sink is capable of 32 mA

▫ Adjustable overvoltage protection (OVP)

▪ 600 kHz to 2 MHz adjustable switching frequency

▫ Open or shorted LED string protection

▫ Open Schottky diode protection

▫ Overtemperature, cycle-by-cycle current limit, undervoltage, and soft start time-out protections

▫ Selectable latched/auto-restart protection modes

▪ No audible MLCC noise during PWM dimming

▪ No pull-up resistors required for LED modules that use ESD capacitors

▪ Extends battery life

▫ Efficiency optimized for 3-cell notebooks

▫ 0.1 μA shutdown current

▫ Unique architecture eliminates external voltage divider and associated battery drain

▪ Rugged and small footprint solution

▫ 55 V, 2 A DMOS switch in 4 mm × 4 mm package—allows IPC-2221/2 / IPC-D-275 compliant PCB layout

Applications

▪ Notebook and sub-notebook displays

▪ LCD monitors

▪ LCD panels