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参数资料
| 型号： | A8508GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE 8X120MA 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，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： | 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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A8508
LED Open Detect
Wide Input Voltage Range, High Efficiency
8-Channel Fault Tolerant LED Driver
extended view of the same situation. Figure 27 shows an OVP
When any LED string opens, the boost control circuit increases
the output voltage until it reaches the overvoltage protection
level. The OVP event causes any LED string that is below regula-
tion level to be disabled. After disabling the open string, the
output voltage returns to normal operating voltage. An EN low
signal will reset the LED string regulation lock.
Figure 25 shows a typical overvoltage condition when the output
voltage is disconnected from the LED load. Figure 26 shows an
condition created by a single open LED string.
Undervoltage Protection (UVP)
If the output voltage is shorted to ground the OVP pin will sense
an undervoltage condition (UVP). When UVP is sensed, the IC
sets the Fault ? ag low which, if used to interface to the output-
disconnect switch, will shut off the P-FET device. Figure 28 is a
schematic showing the input disconnect switch implementation.
OVP limit is reached,
V OUT
OVP level
and string is removed
from control loop
C2
C1
I OUT
V COMP
Fault occurrence
C2
V OUT (30 V)
V LEDx
LED string opens
Control loop reduces V OUT
to new regulation level
C3
V COMP begins to decrease
C3
I OUT
t
Figure 25. OVP operation with all LEDx pins open. V OUT rises to the
overvoltage level and stays there until the IC is shut down; shows V OUT
(ch1, 20 V/div.), I OUT (ch2, 1 A/div.), and V COMP (ch3, 2 V/div.),
t = 2 ms/div.
t
Figure 27. OVP condition created by an open LED string; shows V OUT
(ch1, 2 V/div.), pin voltage V LEDx (ch2, 5 V/div.), and I OUT (ch3,
200 mA/div.), t = 2 ms/div.
C2
C1
V OUT
I OUT
OVP level
Periodic switch node
bursts occur when all
V IN
V DR
AO4421
10 k Ω
L1
C IN (optional)
C3
V COMP
V SW
LEDx pins are open
1 k Ω
1 k Ω
2N7002
A8508
FAULT
C4
t
Figure 26. Extended view of the OVP condition in figure 25; shows V OUT
(ch1, 20 V/div.), I OUT (ch2, 1 A/div.), V COMP (ch3, 1 V/div.), and switch node
(V SW ) (ch4, 20 V/div.), t = 10 ms/div.
Figure 28. Simplified schematic of an external disconnect switch
implementation.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8509 | 制造商:ROCKWE 功能描述: |
| A8509GLPTR-T | 功能描述:IC LED DVR WHITE 4X120MA 24TSSOP 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 |
| 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: |
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