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参数资料
| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.2 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN/MLP-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1204-6 |
A8500
Flexible WLED/RGB Backlight Driver for Medium Size LCDs
Features and Benefits
? Active current sharing between LED strings for ±1.5%
typical current matching and ±1.2% typical accuracy
? Drive up to 12 series × 8 parallel = 96 LEDs
(V f = 3.2 V, I f = 20 mA)
? Flexible dimming, using alternative methods:
? LED duty cycle control (PWM pin)
? DC current using serial programming (EN pin)
? DC current using external PWM signal (APWM pin)
? An external resistor
? Boost converter with integrated 50 V, 2 A DMOS
? LED sinks rated for 25 mA
? 200 kHz to 2 MHz switching frequency
? Open LED disconnect
? Boost current limit, thermal shutdown, and soft start
? No audible ceramic capacitor noise during PWM dimming
? Adjustable overvoltage protection (OVP)
? No pull-up resistors required for LED modules that use
ESD capacitors
Package: 26 pin QFN/MLP (suffix EC)
Description
The A8500 is a multi-output WLED driver for medium display
backlighting. The A8500 integrates a boost converter and eight
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.
Each LED channel can sink 25 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.
The A8500 is available in a 26 pin, 4 mm × 4 mm QFN/MLP
package that is only 0.75 mm nominal in height. Applications
include:
? Thin notebook displays
? LCD TV
? RGB backlight
? GPS systems
? Portable DVD players
Approximate Scale 1:1
Typical Application
EN pin dimming:
serial pulse train input
V IN
5 V ±10%
V BAT
5 to 25 V
L1
10 μ H
D1
V EN
C IN
0.1 μ F/ 10 V
C BAT
1 μ F/ 25 V
ROVP
COUT
I OUT
EN
PWM
VIN
SW SW
OVP
AGND
2.2 μ F
50 V
PWM pin dimming:
digital PWM input
V PWM
I OUT
C C
RFSET
APWM
SKIP
COMP
FSET
ISET
A8500
PGND
SEL3
SEL2
V IN
RISET
SEL1
APWM pin dimming:
analog PWM input
LED1
LED3 LED5 LED7
LGND
LED2
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.
8500P-DS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8501 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:2 MHz, 4 Channel100 mA WLED/RGB Driver |
| A85014-000 | 制造商:TE Connectivity 功能描述:POLYOLEFINS ETC - Bulk 制造商:TE Connectivity 功能描述:MIL-LT-1/2-6-FSP-CS7223 |
| A8501ELPTR-T | 功能描述:IC LED DRVR WT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8501KLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8502 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
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