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参数资料
| 型号： | A6261KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/19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
From these equations (and as illustrated in figure 5) it can be seen
that, if the power in the A6261 is not limited, then it will increase
as the supply voltage increases but the power in the LEDs will
remain constant.
Dissipation Limits
There are two features limiting the power that can be dissipated
by the A6261: thermal shutdown and thermal foldback.
Thermal Shutdown If the thermal foldback feature is disabled
by connecting the THTH pin to GND, or if the thermal resistance
from the A6261 to the ambient environment is high, then the
silicon temperature will rise to the thermal shutdown threshold
and the current will be disabled. After the current is disabled the
power dissipated will drop and the temperature will fall. When
the temperature falls by the hysteresis of the thermal shutdown
circuit, then the current will be re-enabled and the temperature
will start to rise again. This cycle will repeat continuously until
Protected LED Array Driver
running at 50 mA. The forward voltage of each LED is 2.3 V and
the graph shows the current as the supply voltage increases from
14 V to 17 V. As the supply voltage increases, without the thermal
foldback feature, the current would remain at 50 mA, as shown by
the dashed line. The solid line shows the resulting current decrease
as the thermal foldback feature acts.
If the thermal foldback feature did not affect LED current, the
current would increase the power dissipation and therefore the
silicon temperature. The thermal foldback feature reduces power
in the A6261 in order to limit the temperature increase, as shown
in figure 7. The figure shows the operation of the A6261 under
the same conditions as figure 6. That is, 4 strings of 3 red LEDs,
each string running at 50 mA with each LED forward voltage at
54
the ambient temperature drops or the A6261 is switched off. The
period of this thermal shutdown cycle will depend on several
electrical, mechanical, and thermal parameters and could be from
52
50
Without t hermal monitor
a few milliseconds to a few seconds.
Thermal Foldback If there is a good thermal connection to the
A6261, then the thermal foldback feature will have time to act.
This will limit the silicon temperature by reducing the regulated
current and therefore the dissipation.
The thermal monitor will reduce the LED current as the tempera-
ture of the A6261 increases above the thermal monitor activation
48
46
44
42
40
4 Strings
V LED = 6.9 V
I LED = 50 mA
T A = 50°C
With thermal monitor
temperature, T JM , as shown in figure 6. The figure shows the
operation of the A6261 with 4 strings of 3 red LEDs, each string
14.0 14.5 15.0 15.5
Supply Voltage, V IN (V)
Figure 6. LED current versus Supply Voltage.
16.0
16.5
17.0
3.0
130
2.5
2.0
125
120
4 Strings
V LED = 6.9 V
I LED = 50 mA
T A = 50°C
Without thermal monitor
1.5
1.0
LED Power
115
110
With thermal monitor
A6261 Power
0.5
105
0
8
9
10
11
12
13
14
15
16
100
14.0
14.5
15.0
15.5
16.0
16.5
17.0
Supply Voltage, V IN (V)
Figure 5. Power Dissipation versus Supply Voltage.
Supply Voltage, V IN (V)
Figure 7. Junction Temperature versus Supply Voltage.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
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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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