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| 型号： | A8508GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE 8X120MA 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 300kHz ~ 800kHz |
| 电源电压： | 9 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
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A8508
Wide Input Voltage Range, High Efficiency
8-Channel Fault Tolerant LED Driver
Features and Benefits
? Eight integrated high current sinks for LED strings; can be
tied together for even higher currents
? Fixed frequency current mode control with integrated gate
driver / boost controller; powerful gate driver to drive an
external N-channel MOSFET allows significant scaling
capability on the number of LEDs per string
? Parallel operation capability with one boost controller
(master) and up to three additional slave controllers; can
run up to 32 strings of LEDs while populating only a
single master boost regulator
? Active current sharing between LED strings for 0.7%
accuracy and 0.8% matching
? Wide input voltage range: 9 to 40 V
? Internal bias supply for single-supply operation (typically
V IN = 12 or 24 V)
? Fset / Sync function to either set the boost converter
switching frequency or synchronize at up to 800 kHz
? Protection Features
? Open or shorted LED pin protection
? Open Schottky protection
? Pulse-by-pulse current limit
? Overtemperature protection (OTP)
Description
The A8508 is a multi-output white LED driver for backlighting
LCD panels. It integrates a current-mode boost controller and
eight individual current sinks.
The boost controller architecture allows for significant scaling
of boost voltage to optimize the solution for the required
number of LEDs per string. The FSET/SYNC pin either sets
the required boost switching frequency or synchronizes the
value in the range of 300 to 800 kHz.
The LED sink current value is set by an external ISET resistor
(see figure 1). The eight LED sinks can also be combined to
achieve even higher current per LED string.
The A8508 provides protection against output shorts and
overvoltage, open or shorted LED pins, and overtemperature.
A dual-level, pulse-by-pulse current limit function provides
soft start and protects the external current switch against
high current overloads. As an option, the A8508 can drive an
external P-FET interfaced to the ˉF ˉAˉ ˉUˉ ˉLˉ ˉTˉ pin to disconnect the
input supply from the system in the event of short-to-ground
in the boost converter.
The A8508 is available in a 24-pin TSSOP package (suffix LP)
with an exposed thermal pad for enhanced thermal dissipation.
Packages
(Not to scale)
Contact factory for additional options, including: a 24-pin
SOICW (LW) or a a 5 × 5 mm 28-contact QFN (ET) with
exposed thermal pad. All packages are lead (Pb) free, with
100% matte tin leadframe plating.
24-pin TSSOP with
Exposed Thermal Pad
(LP package)
28-contact QFN
with Exposed Thermal
Pad (ET package)
24-pin SOICW
(LW package)
Typical Application
RISET Value versus LED Current
V IN
L1
D1
VOUT
30.00
25.00
V DD
C IN
Q1
COUT
ROVP
20.00
R1
R SENSE
15.00
VIN
GATE SENP
SENN
OVP
10.00
FAULT
5.00
30
50
70
90 110
I LED (mA)
130
150
RVDR
PWM
EN
VDR
VDD
A8508
LED1
LED2
LED3
LED4
FSET/SYNC
PAD
LED5
Figure 1. Typical application circuit
showing 8 channels of LEDs; RZ-CZ
optional (component list shown in the
CDR
CDD
RFSET
RISET
RZ
CZ CP
ISET
COMP
MODE
AGND PGND
LED6
LED7
LED8
Typical Applications section)
A8508-DS, Rev. 1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8510 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
| A8510GECTR-T | 功能描述:IC LED DRVR BCKLGHT/WHT 26QFN-EC RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| A8511 | 制造商:ROCKWE 功能描述: |
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