A8507中文资料LED Backlight Driver for LCD Monitors and Televisions数据手册Allegro规格书

描述 Description

These parts are discontinued.  Samples are no longer available. For new customers or new applications, please contact Allegro. Date of status change: December 2, 2013.

The A8507 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. The A8507 integrates a boost controller to drive external MOSFET and six internal current-sinks. The boost converter is constant frequency current mode converter.

PWM dimming allows LED currents to be controlled in 500:1 ratio. The LED sinks are capable of sinking up to 80 mA each, and can be paralleled together to achieve even higher currents.

The A8507 provides protection against overvoltage, open or shorted LED string, and overtemperature. A dual level cycleby- cycle current limit function provides soft start and protects against overloads.

The device is provided in a 24-pin SOICW package (LB), with internally fused pins for enhanced thermal dissipation, and a 24-pin TSSOP package (LP), with an exposed thermal pad for enhanced thermal dissipation. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

特性 Features

• Fixed frequency current mode control with integrated gate driver
• Each individual current sink is capable of 80 mA
• Adjustable overvoltage protection (OVP)
• Active current sharing between LED strings for ±0.6% accuracy and matching
• 250 kHz to 1 MHz adjustable switching frequency
• Open or shorted LED string protection
• Overtemperature, cycle-by-cycle current limit, and undervoltage protection
• No audible MLCC noise during PWM dimming
• No pull-up resistors required for LED modules that use ESD capacitors
• SOIC 24-pin package for easy single-side PCB manufacturing or TSSOP 24-pin package with exposed thermal pad for better thermal performance

简介

A8507属于集成电路（IC）的LED驱动器。由制造生产的A8507LED 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。