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参数资料
| 型号： | A6261KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC LED ARRAY DVR 400MA 16-TSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 电源电压： | 6 V ~ 50 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1360-6 |
A6261
Safety Features
The circuit includes several features to ensure safe operation and
to protect the LEDs and the A6261:
VIN
A6261
Protected LED Array Driver
? The current regulators between VIN and each LAx output pro-
vide a natural current limit due to the regulation.
? Each LAx output includes a short-to-ground detector that will
disable the output to limit the dissipation.
? An open circuit on any output will disable all outputs.
? The thermal monitor reduces the regulated current as the tem-
perature rises.
? Thermal shutdown completely disables the outputs under ex-
treme overtemperature conditions.
Short Circuit Detection A short-to-ground on any LED
cathode (figure 1A) will not result in a short fault condition. The
current through the remaining LEDs will remain in regulation and
the LEDs will be protected. Due to the difference in the voltage
drop across the LEDs, as a result of the short the current match-
ing in the A6261 may exceed the specified limits.
Any LAx output that is pulled below the short detect voltage
(figure 1B) will disable the regulator on that output and allow
the fault flag, FF, to go high. A small current will be sourced
from the disabled output to monitor the short and detect when
it is removed. When the voltage at LAx rises above the short
detect voltage the fault flag will be removed and the regulator
re-enabled.
A shorted LED (figure 1C) will not result in a short fault condi-
tion. The current through the remaining LEDs will remain in
regulation and the LEDs will be protected. Due to the difference
in the voltage drop across the LEDs, as a result of the short, the
current matching in the A6261 may exceed the specified limits.
A short between LEDs in different strings (figure 1D) will not
result in a short fault condition. The current through the remain-
ing LEDs will remain in regulation and the LEDs will be pro-
tected. The current will be summed and shared by the affected
strings. Current matching in the strings will then depend on the
LED forward voltage differences.
Open Load Detection An open load condition is detected
when the voltage across the regulator, V IN – V LAx , is less than
the open load detect voltage, V OCD , but greater than the output
disable threshold voltage, V ODIS . When this condition is present
for more than the open load detect time, t OCD , then all regulators
will be disabled and the fault flag allowed to go high.
LA1
LA2
LA3
LA4
GND
VIN
A6261
LA1
LA2
LA3
LA4
GND
VIN
A6261
LA1
LA2
LA3
LA4
GND
VIN
A6261
LA1
LA2
LA3
LA4
GND
Figure 1. Short circuit conditions.
A. Any LED cathode short-to-ground.
Current remains regulated in
non-shorted LEDs. Matching may be
affected. FF is low.
B. Any LAx output short-to-ground.
Shorted output is disabled. Other
outputs remain active. FF is high.
C. Shorted LEDs.
Current remains regulated.
Matching may be affected.
Only the shorted LED is inactive.
FF is low.
D. Short between LEDs in different
strings. Current remains regulated.
Current is summed and shared by
affected strings. Intensity match
dependent on voltage binning.
FF is low.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A6261KLYTR-T | 功能描述:IC LED ARRAY DVR 400MA 10-MSOP 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 |
| A6262 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6262 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. |
| A6262KLPTR-T | 功能描述:IC LED ARRAY DRIVER AUTO 16TSSOP 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 |
| A6262KLYTR-T | 功能描述:IC LED ARRAY DRIVER AUTO 10-MSOP 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 |
| A6263 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Protected LED Array Driver |
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