Datasheet > A8500

A8500

更新时间： 2024-11-09 03:17:07

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
16页	1221K
描述
Flexible WLED/RGB Backlight Driver for Medium Size LCDs

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中文翻译

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A8500 数据手册

A8500

Flexible WLED/RGB Backlight Driver for Medium Size LCDs

Features and Benefits

Description

▪ꢀ ActiveꢀcurrentꢀsharingꢀbetweenꢀLEDꢀstringsꢀforꢀ±1.5%ꢀ

typicalꢀcurrentꢀmatchingꢀandꢀ±1.2%ꢀtypicalꢀaccuracy

▪ꢀ Driveꢀupꢀtoꢀ12ꢀseriesꢀ× 8 parallel = 96 LEDs

(V_f= 3.2 V, I_f= 20 mA)

TheA8500 is a multi-outputWLED driver for medium display

backlighting.TheA8500integratesaboostconverterandeight

current-sinks to provide a flexible WLED/RGB backlight

driver. The boost converter can provide output voltage up to

47 V. The flexible channel selection control and high voltage

capability allow a wide range of LED backlight applications.

The A8500 can support any application requiring 4 to 96

WLEDs. The boost converter is a constant frequency current-

mode converter.

▪ꢀ Flexibleꢀdimming,ꢀusingꢀalternativeꢀmethods:

▫ꢀ LED duty cycle control (PWM pin)

▫ꢀ DC current using serial programming (EN pin)

▫ꢀ DC current using external PWM signal (APWM pin)

▫ꢀ An external resistor

▪ꢀ Boostꢀconverterꢀwithꢀintegratedꢀ50ꢀV,ꢀ2ꢀAꢀDMOS

▪ꢀ LEDꢀsinksꢀratedꢀforꢀ30ꢀmA

▪ꢀ 200ꢀkHzꢀtoꢀ2ꢀMHzꢀswitchingꢀfrequency

▪ꢀ OpenꢀLEDꢀdisconnect

Each LED channel can sink 30 mA, and channels can be

paralleled for higher currents. Flexible dimming allows output

channels to either run at an adjustable DC value or with

externally controlled PWM duty cycles.

▪ꢀ Boostꢀcurrentꢀlimit,ꢀthermalꢀshutdown,ꢀandꢀsoftꢀstart

The A8500 is available in a 26 pin, 4 mm × 4 mm QFN/MLP

▪ꢀ NoꢀaudibleꢀceramicꢀcapacitorꢀnoiseꢀduringꢀPWMꢀdimming package that is only 0.75 mm nominal in height. Applications

▪ꢀ Adjustableꢀovervoltageꢀprotectionꢀ(OVP)

▪ꢀ Noꢀpull-upꢀresistorsꢀrequiredꢀforꢀLEDꢀmodulesꢀthatꢀuseꢀ

ESD capacitors

include:

▪ꢀ Thinꢀnotebookꢀdisplays

▪ꢀ LCDꢀTV

▪ꢀ RGBꢀbacklight

▪ꢀ GPSꢀsystems

▪ꢀ PortableꢀDVDꢀplayers

Package: 26 pin QFN/MLP (suffix EC)

Approximate Scale 1:1

Typical Application

EN pin dimming:

serial pulse train input

10 µH

V_BAT

5 to 25 V

V_S

5 V ±10%

C_IN

0.1 µF/ 10 V

C_BAT

1 µF/ 25 V

V_EN

ROVP

COUT

VIN

SW SW

OVP

AGND

2.2 µF

50 V

I_OUT

PWM

APWM

SKIP

PGND

PWM pin dimming:

digital PWM input

A8500

COMP

V_PWM

V_IN

SEL3

SEL2

FSET

C_C

RFSET

RISET

ISET

I_OUT

SEL1

LED2

LED1

APWM pin dimming:

analog PWM input

LED3 LED5 LED7 LGND

LED8 LED6 LED4

V_APWM

I_OUT

Figure 1. LCD monitor backlight, driving 96 LEDs. LED V_f= 3.2 V, 20 mA per LED string. Overvoltage

protection set to 45 V nominal (40.5 V minimum). Alternative dimming control pulse trains illustrated

for EN, PWM, and APWM control. See also: Recommended Components table, page 14.

8500-DS

12 3 4 5 6 7...16

中文翻译

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与A8500相关器件

型号	品牌	获取价格	描述	数据表
A-8500-1.000MHZ	CTS	获取价格	Oscillator,
A-8500-150.000MHZ	CTS	获取价格	Oscillator,
A8500EECTR-T	ALLEGRO	获取价格	Flexible WLED/RGB Backlight Driver for Medium Size LCDs
A-8500-FREQ	CTS	获取价格	HCMOS/TTL Output Clock Oscillator, 1MHz Min, 150MHz Max, ROHS COMPLIANT, HERMETIC SEALED,
A8500GECTR-T	ALLEGRO	获取价格	Liquid Crystal Driver, 8-Segment, 4 X 4 MM, LEAD FREE, MO-220WGGE, MLP-26
A8501	ALLEGRO	获取价格	2 MHz, 4 Channel100 mA WLED/RGB Driver
A8501	AITSEMI	获取价格	PWM CONTROL STEP-UP DC-DC CONVERTER
A8501E5R	AITSEMI	获取价格	PWM CONTROL STEP-UP DC-DC CONVERTER
A8501E5VR	AITSEMI	获取价格	PWM CONTROL STEP-UP DC-DC CONVERTER
A8501GLPTR-T	ALLEGRO	获取价格	LED Driver, 24-Segment, PDSO28, LEAD FREE, MO-153AET, TSSOP-28

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