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| 型号： | A8507ELBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/17页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER WLED/RGB 24-SOIC |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 250kHz ~ 1MHz |
| 电源电压： | 4.3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8507
LED Backlight Driver for LCD Monitors and Televisions
Features and Benefits
? 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
Packages:
Description
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 cycle-
by-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.
24-pin TSSOP
with exposed thermal pad
(Package LP)
24-pin SOICW
with internally fused pins
(LB package)
Not to scale
Functional Block Diagram
V BAT
4.7 μ F
10 μ H
2.2 μ F
P
R SC
P
R OVP
P
DRIVER
SENP
SENN
OVP
R FSET
C COMP
FSET
OCP SS
COMP
OSC
Current Mode
Boost
Controller
Ref
Control and
6
Overvoltage
Protection
LED1
Feedback
R ISET
ISET
Reference
LED2
PWM
100 k Ω
Current
LED3
LED Select
Logic
6
LED4
+5 V
10 k Ω
EN
VIN
0.1 μ F
Control
Logic/
UVLO
TSD
OVP
OCP
Open/Short
LED Detect
6
LED5
FAULT
LED6
PGND
GND
GND
LP Only
PAD
LGND
LB Only
LGND
Figure 1. Functional block diagram
showing 6 parallel strings with 9 series
A8507-DS, Rev. 2
P
LEDs per channel
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8509 | 制造商:ROCKWE 功能描述: |
| A8509GLPTR-T | 功能描述:IC LED DVR WHITE 4X120MA 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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