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参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 17/33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
LED short detect
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
The following equation can be used to determine the resistance
All of the LEDx pins are capable of handling the maximum V OUT
that the converter can deliver, thus providing protection from the
LED pin to V OUT in the event of a connector short.
for setting the OVP level:
R OVP = ( V OUTovp – V OVP(th) ) / I OVPH
where:
(4)
Any LEDx pin that has a voltage exceeding V LEDSC will be
removed from operation (see figure 20). This is to prevent the IC
from dissipating too much power by having a large voltage pres-
ent on the LEDx pin.
While the IC is being PWM-dimmed, the IC rechecks the dis-
abled LEDx pin every time the PWM signal goes high, to prevent
false tripping of an LEDx short event. This also allows some self-
correction if an intermittent LEDx pin short-to-V OUT is present.
Overvoltage protection
The A8510 has overvoltage protection (OVP) and open Schottky
diode (D1) protection. The OVP protection has a default level of
8 V and can be increased up to 55 V by connecting R OVP between
the OVP pin and V OUT . When the current into the OVP pin
exceeds 199 μ A typical, the OVP comparator goes low and the
boost stops switching.
V LED
C1
EN/PWM
C2
V OUTovp is the target overvoltage level,
R OVP is the value of the external resistor, in Ω ,
V OVP(th) is the pin OVP trip point found in the Electrical Charac-
teristics table, and
I OVPH is the current into the OVP pin.
There are several possibilities for why an OVP condition would
be encountered during operation, the two most common being: an
open LED string, and a disconnected output. Examples of these
are provided in figures 21 and 22.
Figure 21 illustrates when the output of the A8510 is discon-
nected from load during normal operation. The output voltage
instantly increases up to OVP voltage level and then the boost
stops switching to prevent damage to the IC. If the output is
drained off, eventually the boost might start switching for a short
duration until the OVP threshold is hit again.
C3
I LED
t
Figure 20. Example of the disabling of an LED string when the LED pin
voltage is increased above 4.6 V; shows V LED (ch1, 5 V/div.), EN/PWM
(ch2, 5 V/div.), and I LED (ch3, 50 mA/div.), t = 20 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
17
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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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