- 您现在的位置：买卖IC网 > Datasheet目录307 > A8510GECTR-T (Allegro Microsystems Inc)IC LED DRVR BCKLGHT/WHT 26QFN-EC Datasheet资料下载
参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/33页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BCKLGHT/WHT 26QFN-EC |
| 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： | 白色 LED |
| 频率： | 600kHz ~ 2.25MHz |
| 电源电压： | 5 V ~ 40 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 ~ 105°C |
| 其它名称： | 620-1385-6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页当前第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Functional Description
The A8510 incorporates a current-mode boost controller with
internal DMOS switch, and eight LED current sinks. It can be
used to drive eight LED strings of up to 12 white LEDs in series,
with current up to 40 mA per string. For optimal efficiency,
the output of the boost stage is adaptively adjusted to the mini-
mum voltage required to power all of the LED strings. This is
expressed by the following equation:
Powering up: LED pin short-to-GND check
The VIN pin has a UVLO function that prevents the A8510 from
powering-up until the UVLO threshold is reached. After the VIN
pin goes above UVLO, and a high signal is present on the EN/
PWM pin, the IC proceeds to power-up. As shown in figure 3, at
this point the A8510 enables the disconnect switch and checks if
any LED pins are shorted to GND and/or are not used. The LED
detect phase starts when the VGATE voltage of the disconnect
V OUT = max ( V LED1 ,..., V LED8 ) + V REG
(1)
switch is equal to V IN – 4.5 V.
where
V LEDx is the voltage drop across LED strings 1 through 8, and
V REG is the regulation voltage of the LED current sinks (typi-
cally 0.68 V at the maximum LED current).
After the voltage threshold on the LEDx pins exceeds 120 mV, a
timer of 3000 to 4000 clock cycles is used to determine the status
of the pins. Thus, the LED detection duration varies with the
switching frequency, as shown in the following table:
Enabling the IC
The IC turns on when a logic high signal is applied on the
EN/PWM pin with a minimum duration of t PWMH for the first
clock cycle, and the input voltage present on the VIN pin is
greater than the 4.35 V necessary to clear the UVLO (V UVLOrise )
threshold. The power-up sequence is shown in figure 2. Before
Switching Frequency
(kHz)
2000
1000
800
600
Detection Time
(ms)
1.5 to 2
3 to 4
3.75 to 5
5 to 6.7
the LEDs are enabled, the A8510 driver goes through a system
The LED pin detection voltage thresholds are as follows:
check to determine if there are any possible fault conditions that
might prevent the system from functioning correctly. Also, if the
FSET/SYNC pin is pulled low, the IC will not power-up. More
information on the FSET/SYNC pin can be found below, in the
Synchronization section of this document.
LED Pin Voltage
<70 mV
150 mV
>325 mV
LED Pin Status
Short-to-GND
Not used
LED pin in use
Action
Power-up is halted
LED removed from operation
None
V GATE = V IN – 4.5 V
VDD
VGATE
C1
FSET/SYNC
C1
LEDx
C2
ISET
C2
LED detection period
C3
EN/PWM
C4
t
Figure 2. Power-up diagram at f SW = 2 MHz; shows VDD (ch1, 2 V/div.),
FSET/SYNC (ch2, 1 V/div.), ISET (ch3, 1 V/div.), and EN/PWM (ch4, 2 V/
div.) pins, t = 200 μ s/div.
ISET
C3
C4
EN/PWM
t
Figure 3. Power-up diagram; shows the relationship of an LEDx pin with
respect to the gate voltage of the disconnect switch (if used) during the
LED detect phase, as well as the duration of the LED detect phase for a
switching frequency of 800 kHz; shows VGATE (ch1, 5 V/div.), LEDx (ch2,
500 mV/div.), ISET (ch3, 1 V/div.), and EN/PWM (ch4, 5 V/div.) pins,
t = 1 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| A8511KLPTR-T | IC LED DVR 150MA AUTO 28-TSSOP |
| A8512ELBTR-T | IC LED DVR WHT/RGB BKLGT 24SOIC |
| A8513KLPTR-T | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| A8514KLPTR-T | IC LED DVR WHT 4X80MA 16-ETSSOP |
| A8515GLPTR-T | IC LED DVR WHT/RGB BKLGT 16TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8512EETTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28QFN 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 |
| A8512ELBTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24SOIC 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 |
发布紧急采购，3分钟左右您将得到回复。