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参数资料
| 型号： | A6264KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR STOP/TAIL 16-TSSOP |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | 汽车用，高亮度（HBLED） |
| 输出数： | 4 |
| 拓扑： | 恒定电流，线性（LDO），PWM |
| 频率： | * |
| 效率： | * |
| 电流 - 输出 / 通道： | 100mA |
| 输出电压： | * |
| 电源电压： | 6 V ~ 50 V |
| 内部开关： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-TSSOP-EP |
| 其它名称： | 620-1364-6 |
A6264
Automotive Stop/Tail LED Array Driver
From these equations (and as illustrated in figure 4) it can be seen
that, if the power in the A6264 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 A6264: thermal shutdown and thermal foldback.
Thermal Shutdown If the thermal resistance from the A6264
to the ambient temperature 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 the ambient temperature
drops or the A6264 is switched off. The period of this thermal
shutdown cycle will depend on several electrical, mechanical,
and thermal parameters, and could be from a few milliseconds to
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 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 A6264 in order to limit the temperature increase, as shown
in figure 6. The figure shows the operation of the A6264 under
the same conditions as figure 5. That is, 4 strings of 3 red LEDs,
each string running at 50 mA with each LED forward voltage at
2.3 V. The graph shows the temperature as the supply voltage
54
52
a few seconds.
50
Without t hermal monitor
Thermal Foldback If there is a good thermal connection to the
A6264, 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 A6264 increases above the thermal monitor activation
48
46
44
42
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 5. The figure shows the
operation of the A6264 with 4 strings of 3 red LEDs, each string
40
14.0
14.5
15.0
15.5
16.0
16.5
17.0
Supply Voltage, V IN (V)
Figure 5. LED current versus Supply Voltage.
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
LED Power
115
With thermal monitor
1.0
0.5
A6262 Power
4 Strings
V LED = 6.9 V
I LED = 50 mA
110
105
0
70
80
90
100 110 120
Supply Voltage, V IN (V)
130
140
150
100
14.0
14.5
15.0 15.5
Supply Voltage, V IN (V)
16.0
16.5
17.0
Figure 4. Power Dissipation versus Supply Voltage.
Figure 6. 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
10
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相关代理商/技术参数 |
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| A6264KLYTR-T | 功能描述:IC LED DVR STOP/TAIL 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 |
| A6265 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6265 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. |
| A6265KLPTR-T | 功能描述:IC LED CTLR HI CURRENT 16-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 |
| A6266 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6266 is a boost converter controller, providing a programmable constant current output for driving high power LEDs in series. |
| A6266KLPTR-T | 功能描述:IC LED CTLR AUTO HI CURR 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 |
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