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| 型号： | A8508GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/28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
Table 1. Fault Modes
Wide Input Voltage Range, High Efficiency
8-Channel Fault Tolerant LED Driver
Fault Name
Primary switch current
protection (pulse-by-
pulse current limit)
Type
Auto-restart
Active
Always
Fault
Flag
Set
No
Description
This fault condition is triggered by the pulse-by-pulse current limit
when the SENSP pin voltage exceeds V SENSEP .
Boost
Off for
a single
cycle
Sink
driver
On
When the current through the boost switch exceeds the secondary
Secondary switch
current limit
Latched
Always
Yes
current limit (V SENSESEC ) the IC immediately shuts down the LED
drivers and the boost. To re-enable the A8508 the EN pin must be
Off
Off
toggled.
This fault prevents the IC from starting-up if any of the LEDx pins are
LEDx pin short to GND
protection
Auto-restart
Startup
Yes
shorted. The IC stops soft start from starting while any of the LEDx
pins are determined to be shorted. After the short is removed, soft
Off
Off
start is allowed to start.
When an LEDx pin is open the device will determine which LEDx
Off for
LEDx pin open
Auto-restart
Normal
operation
No
pin is open by increasing the output voltage until OVP is reached.
Any LED string below regulation will be turned off. The device then
goes back to normal operation by reducing the output voltage to the
On
open
pins. On
for all
appropriate voltage level.
others
Off for
LED short protection
Auto-restart
Always
No
This fault occurs when the LED pin voltage exceeds V LEDSC . When
the LED short protection is detected, the LED string that is above the
On
shorted
pins. On
threshold will be removed from operation.
This fault occurs when the FSET pin current goes above 150% of the
for all
others
On in
FSET pin short
protection
Auto-restart
Always
No
maximum current. The boost stops switching, and the IC disables
the LED sinks until the fault is removed. When the fault is removed
Off
soft
start
the IC tries to restart with soft start.
This fault occurs when the ISET pin current goes above 150% of the
current
ISET pin short
protection
Auto-restart
Always
No
maximum current. The boost stops switching and the IC disables the
LED sinks until the fault is removed. When the fault is removed the
Off
Off
IC tries to regulate to the preset LED current.
Overvoltage protection
Auto-restart
Always
No
The fault occurs when the OVP pin voltage exceeds the V OVP(th)
threshold. The A8508 immediately stops switching to try to reduce
the output voltage. If the output voltage decreases then the A8508
Stop
during
OVP
On
restarts switching to regulate the output voltage.
event
Output undervoltage
protection
Overtemperature
protection
VIN UVLO
Auto-restart
Auto-restart
Auto-restart
Always
Always
Always
Yes
Yes
No
This fault occurs when the OVP pin senses less than 100 mV on the
pin. The IC disables the external P-FET switch, if one is used.
The fault occurs when the die temperature exceeds the
overtemperature threshold, typically 165°C.
This fault occurs when V IN drops below V UVLO(th) (max), 8.5 V. This
fault resets all latched faults.
Off
Off
Off
Off
Off
Off
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
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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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