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参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/33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 |
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A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Figure 22 displays a typical OVP event caused by an open LED
string. After the OVP condition is detected, the boost stops
switching, and the open LED string is removed from operation.
Afterwards V OUT is allowed to fall, and eventually the boost will
resume switching and the A8510 will resume normal operation.
A8510 also has built-in secondary overvoltage protection to pro-
tect the internal switch in the event of an open diode condition.
Open Schottky diode (D1) detection is implemented by detecting
overvoltage on the SW pins of the device. If voltage on the SW
pins exceeds the device safe operating voltage rating, the A8510
disables and remains latched. To clear this fault, the IC must be
shut down either by using the PWM signal or by going below the
UVLO threshold on the VIN pin. Figure 23 illustrates this. As
soon as the switch node voltage (SW) exceeds V OVP(sec) , the IC
shuts down. Due to small delays in the detection circuit, as well
as there being no load present, the switch node voltage will rise
above the trip point voltage.
Figure 24 illustrates when the A8510 is being enabled during an
open diode condition. The IC goes through all of its initial LED
detection and then tries to enable the boost, at which point the
open diode is detected.
Output disconnect
event detected
V OUT
V OUT
LED string open
condition detected
SW node
SW node
C2
C2
C1
C3
C4
EN/PWM
I LED
C1
C3
EN/PWM
I LED
C4
t
Figure 21. OVP protection in an output disconnect from load event; shows
V OUT (ch1, 10 V/div.), SW node (ch2, 20 V/div.), EN/PWM (ch3, 5 V/div.),
and I LED (ch4, 50 mA/div.), t = 2 ms/div.
t
Figure 22. OVP protection in an open LED string event; shows V OUT
(ch1, 10 V/div.), SW node (ch2, 20 V/div.), EN/PWM (ch3, 5 V/div.), and
I LED (ch4, 200 mA/div.), t = 1 ms/div.
EN/PWM
Open diode
condition detected
C1
SW node
C1
SW node
C2
Open diode
condition detected
I OUT
C2
V OUT
FAULT
C3
C3
EN/PWM
C4
I LED
C4
t
Figure 23. OVP protection in an open Schottky diode D1 event, while the
IC is in normal operation; shows SW node (ch1, 50 V/div.), I OUT (ch2, 500
mA/div.), ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch3, 5 V/div.), and EN/PWM (ch4, 5 V/div.), t = 2 μ s/div.
t
Figure 24. OVP protection when the IC is enabled during an open diode
condition; shows EN/PWM (ch1, 5 V/div.), SW node (ch2, 50 V/div.), V OUT
(ch3, 10 V/div.), and I LED (ch4, 200 mA/div.), t = 500 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
相关PDF资料 |
PDF描述 |
|---|---|
| A8511KLPTR-T | IC LED DVR 150MA AUTO 28-TSSOP |
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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 |
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