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| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| 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： | RGB，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.2 V ~ 5.5 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 ~ 85°C |
| 产品目录页面： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1204-6 |
A8500
Calculate the value for R OVP as follows:
R OVP = ( V OVP – 30) / 54.9 μ A ,
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
LED string when overvoltage on the OVP pin is detected. This
string is then removed from the boost controlling loop. The boost
circuit is then controlled in the normal manner, and the output
where V OVP is the desired typical OVP level in V, and R OVP is
in Ω . For tighter OVP limits, a low–leakage-current Zener diode,
DZ, can be used, instead of ROVP, to set OVP at up to 47 V. For
redundancy, DZ can be connected across ROVP to provide addi-
tional protection, if ROVP should open. Select a 17 V low-leak-
age Zener diode for DZ.
Open LED Protection. The A8500 has protection against open
LEDs. If any enabled LED string opens, voltage on the corre-
sponding LED x pin goes to zero. The boost loop operates in open
loop till the OVP level is reached. The A8500 identifies the open
voltage is regulated, to provide the output required to drive the
remaining strings. If the open LED string is reconnected, it will
sink current up to the programmed current level.
Note: Open strings are removed from boost regulation, but not
disabled. This keeps the string in operation if LEDs open for only
a short length of time, or reach OVP level on a transient event.
The disconnected string can be restored to normal mode by re-
enabling the IC. It can also restored to normal operation if the
fault signal is removed from the corresponding LED x pin, but an
OVP event occurs on any other LED x pin.
C1
I OUT
V OUT
LED string
opens
Overvoltage
detected,
OVP begins
Normal operation
resumes with open
LED string removed
from control loop
I OUT
V OUT
C2
I IN
I IN
C3
t
Symbol
C1
C2
C3
t
Parameter
I OUT
V OUT
I IN
time
Units/Division
50 mA
10 V
500 mA
200 μ s
Figure 11. Open LED fault protection.
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
12
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8501 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:2 MHz, 4 Channel100 mA WLED/RGB Driver |
| A85014-000 | 制造商:TE Connectivity 功能描述:POLYOLEFINS ETC - Bulk 制造商:TE Connectivity 功能描述:MIL-LT-1/2-6-FSP-CS7223 |
| A8501ELPTR-T | 功能描述:IC LED DRVR WT/RGB BKLGT 28TSSOP 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 |
| A8501KLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28TSSOP 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 |
| A8502 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
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