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| 型号： | A8509GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE 4X120MA 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 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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A8509
Wide Input Voltage Range, High Efficiency
4-Channel Fault Tolerant LED Driver
Features and Benefits
? Four 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 with one boost controller (master) and
up to three additional slave controllers; can run up to
16 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)
? Separate Enable and PWM pins as interface for Enable
and PWM Dimming functions
? 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)
Packages
(Not to scale)
Description
The A8509 is a multi-output white LED driver for backlighting
LCD panels. It integrates a current-mode boost controller and
four 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 four LED sinks can also be combined to
achieve even higher current per LED string.
The A8509 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 A8509 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.
Package options are 24-pin TSSOP (suffix LP) and SOICW
(LB) packages. The TSSOP has an exposed thermal pad, and
the SOICW has four interally-fused pins, for enhanced thermal
dissipation. The Both packages are lead (Pb) free, with 100%
matte tin leadframe plating.
24-pin TSSOP with
Exposed Thermal Pad
(LP package)
24-pin SOICW with
Four Internally-Fused Pins
(LB package)
Typical Application
V IN
V DD
A8509
30.00
25.00
20.00
15.00
10.00
5.00
60
RISET Value versus LED Current
100 140 180 220 260 300
I LED (mA)
L1 D1
C IN
VIN GATE SENP SENN
FAULT
PWM
EN
VDR
VDD
FSET/SYNC PAD
Q1
COUT
R1 R SENSE
VOUT
ROVP
OVP
LED1
LED2
LED3
LED4
Figure 1. Typical application circuit
showing 4 channels of LEDs; RZ-CZ
optional (component list shown in the
Typical Applications section)
CDR
CDD
RFSET
RISET
RZ
CZ CP
ISET
COMP
MODE
AGND PGND
A8509-DS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| A8511KLPTR-T | 功能描述:IC LED DVR 150MA AUTO 28-TSSOP 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 |
| A8512 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LED Backlight Driver for Medium/Large Displays |
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