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参数资料
| 型号： | A8504EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/19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 |
| 输出电压： | 47V |
| 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： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1215-6 |
A8504
WLED/RGB Backlight Driver for Medium Size LCDs
Features and Benefits
? Active current sharing among 8 LED strings for ±1.3%
typical current matching
? ±1.2% typical current accuracy
? Drive up to 11 series × 8 parallel = 88 LEDs
(V f = 3.5 V, I f = 40 mA)
? External PWM control for LED dimming
? An external resistor for LED current setting
? Boost converter with integrated 50 V, 2 A DMOS
? LED sinks rated for 45 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
Description
The A8504 is a multi-output WLED driver for medium display
backlighting. The A8504 integrates a boost converter and eight
current-sinks to provide a 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 boost
converter is a constant frequency current-mode converter. Each
LED channel can sink 45 mA, and channels can be paralleled
for higher currents. LED current can be controlled with external
PWM duty cycle.
The A8504 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
Package: 26 pin QFN/MLP (suffix EC)
Approximate Scale 1:1
Typical Application
V IN
5 V ±10%
V BAT
5 to 24 V
L1
10 μ H
D1
V OUT
PWM pin dimming:
digital PWM input
C IN
0.1 μ F/ 10 V
C BAT
2.2 μ F/ 50 V
ROVP
COUT
V PWM
I OUT
PWM
VIN
SW SW
OVP
GND
2.2 μ F
50 V
SKIP
A8504
AGND
PGND
C C
RFSET
COMP
FSET
ISET
SEL3
SEL2
V IN
RISET
LED1
SEL1
LED2
LED3 LED5 LED7
LGND
LED8 LED6 LED4
Figure 1. LCD monitor backlight, driving 11 green, blue, or white LEDs with V f = 3.5 V, or 18 red LEDs with V f = 2.2 V,
per LED string. Overvoltage protection set to 45 V nominal (40.5 V minimum). See also: Recommended Components
table , page 16.
8504-DS, Rev. 3
相关PDF资料 |
PDF描述 |
|---|---|
| A8507ELBTR-T | IC DRIVER WLED/RGB 24-SOIC |
| A8508GLPTR-T | IC LED DVR WHITE 8X120MA 24TSSOP |
| A8509GLPTR-T | IC LED DVR WHITE 4X120MA 24TSSOP |
| A8510GECTR-T | IC LED DRVR BCKLGHT/WHT 26QFN-EC |
| A8511KLPTR-T | IC LED DVR 150MA AUTO 28-TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8507 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LED Backlight Driver for LCD Monitors and Televisions |
| A8507ELBTR-T | 功能描述:IC DRIVER WLED/RGB 24-SOIC 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 |
| A8507ELPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24TSSOP 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 |
| A8508 | 制造商:ROCKWE 功能描述: |
| A8508GLPTR-T | 功能描述:IC LED DVR WHITE 8X120MA 24TSSOP 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 |
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