Datasheet > A8507

A8507

更新时间： 2024-11-09 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器显示器电视
页数	文件大小	规格书
16页	600K
描述
LED Backlight Driver for LCD Monitors and Televisions

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中文翻译

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数据手册

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A8507 数据手册

A8507

LED Backlight Driver for LCD Monitors and Televisions

Features and Benefits

Description

▪ Fixed frequency current mode control with integrated

gate driver

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.

▪ 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

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.

▪ 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

The A8507 provides protection against overvoltage, open or

shorted LED string, and overtemperature. A dual level cycle-

by-cycle current limit function provides soft start and protects

against overloads.

The device is provided in a 24-pin SOICWpackage (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.

Packages:

24-pin TSSOP

with exposed thermal pad

(Package LP)

24-pin SOICW

with internally fused pins

(LB package)

Not to scale

Functional Block Diagram

BAT

10 μH

4.7 μF

2.2 μF

OVP

DRIVER

SENP SENN

OVP

FSET

Current Mode

Boost

Controller

OSC

FSET

Overvoltage

Protection

Ref

OCP SS

COMP

LED1

Control and

Feedback

ISET

LED2

LED3

ISET

Reference

Current

PWM

100 kΩ

LED Select

Logic

LED4

LED5

LED6

TSD

Control

Logic/

UVLO

+5 V

OVP

OCP

VIN

Open/Short

LED Detect

10 kΩ

0.1 μF

FAULT

LB Only

LGND

LP Only

PAD

Figure 1. Functional block diagram

showing 6 parallel strings with 9 series

LEDs per channel

PGND

GND

LGND

A8507-DS, Rev. 2

12 3 4 5 6 7...16

中文翻译

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与A8507相关器件

型号	品牌	获取价格	描述	数据表
A8507ELBTR-T	ALLEGRO	获取价格	LED Driver, 54-Segment, PDSO24, LEAD FREE, MS-013AD, SOIC-24
A8507ELPTR-T	ALLEGRO	获取价格	LED Driver, 54-Segment, PDSO24, LEAD FREE, MO-153ADT, TSSOP-24
A8508	ALLEGRO	获取价格	Wide Input Voltage Range, High Efficiency
A8508GLPTR-T	ALLEGRO	获取价格	LED Driver, 8-Segment, PDSO24, TSSOP-24
A8509	ALLEGRO	获取价格	Wide Input Voltage Range, High Efficiency
A8509GLBTR-T	ALLEGRO	获取价格	LED Driver, 4-Segment, PDSO24, LEAD FREE, SOIC-24
A8509GLPTR-T	ALLEGRO	获取价格	LED Driver, 4-Segment, PDSO24, LEAD FREE, MO-153ADT, TSSOP-24
A8510	ALLEGRO	获取价格	Wide Input Voltage Range, High Efficiency
A8510GECTR-T	ALLEGRO	获取价格	LED Driver, MO-220WGGE, QFN-26
A8511	ALLEGRO	获取价格	2 MHz, 4 Channel Ã 150 mA WLED/RGB Driver

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