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参数资料
| 型号： | A6262KLYTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC LED ARRAY DRIVER AUTO 10-MSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 恒定电压： | 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1361-6 |
A6262
2.3 V. The graph shows the temperature as the supply voltage
increases from 14 to 17 V. Without the thermal foldback feature
the temperature would continue to increase up to the thermal
shutdown temperature as shown by the dashed line. The solid line
shows the effect of the thermal foldback function in limiting the
temperature rise.
Figures 6 and 7 show the thermal effects where the thermal
resistance from the silicon to the ambient temperature is 40°C/W.
Thermal performance can be enhanced further by using a signifi-
cant amount of thermal vias as described below.
Thermal Dissipation
The amount of heat that can pass from the silicon of the A6262
to the surrounding ambient environment depends on the thermal
resistance of the structures connected to the A6262. The thermal
resistance, R θ JA , is a measure of the temperature rise created by
power dissipation and is usually measured in degrees Celsius per
watt (°C/W).
The temperature rise, Δ T, is calculated from the power dissipated,
P D , and the thermal resistance, R θ JA , as:
Automotive LED Array Driver
? For minimum supply voltage the limiting factor is the maximum
drop-out voltage of the regulator, where the difference between
the load voltage and the supply is insufficient for the regulator
to maintain control over the output current.
Minimum Supply Limit: Regulator Saturation Voltage
The supply voltage, V IN , is always the sum of the voltage drop
across the high-side regulator, V REG , and the forward voltage of
the LEDs in the string, V LED , as shown in figure 4.
V LED is constant for a given current and does not vary with
supply voltage. Therefore V REG provides the variable difference
between V LED and V IN . V REG has a minimum value below which
the regulator can no longer be guaranteed to maintain the output
current within the specified accuracy. This level is defined as the
regulator drop-out voltage, V DO .
The minimum supply voltage, below which the LED current does
not meet the specified accuracy, is therefore determined by the
sum of the minimum drop-out voltage, V DO , and the forward
voltage of the LEDs in the string, V LED . The supply voltage must
Δ T = P D × R θ JA
(9)
A thermal resistance from silicon to ambient, R θ JA , of approxi-
mately 30°C/W (LP package) or 34°C/W (LY package) can be
achieved by mounting the A6262 on a standard FR4 double-sided
printed circuit board (PCB) with a copper area of a few square
inches on each side of the board under the A6262. Multiple
thermal vias, as shown in figure 8, help to conduct the heat from
the exposed pad of the A6262 to the copper on each side of the
board. The thermal resistance can be reduced by using a metal
substrate or by adding a heatsink.
Supply Voltage Limits
In many applications, especially in automotive systems, the avail-
able supply voltage can vary over a two-to-one range, or greater
when double battery or load dump conditions are taken into con-
sideration. In such systems is it necessary to design the applica-
tion circuit such that the system meets the required performance
targets over a specified voltage range.
To determine this range when using the A6262 there are two
limiting conditions:
? For maximum supply voltage the limiting factor is the power
that can be dissipated from the regulator without exceeding the
temperature at which the thermal foldback starts to reduce the
output current below an acceptable level.
Figure 8. Board via layout for thermal dissipation: (top) LP
package and (bottom) LY package.
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 |
参数描述 |
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| A6263 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Protected LED Array Driver |
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| A6263KLJTR-T | 制造商:Allegro MicroSystems LLC 功能描述:IC LED ARRAY DRIVER AUTO 8SOIC 制造商:Allegro MicroSystems LLC 功能描述:FOUR CHANNEL LINEAR LED DRIVER |
| A6264 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6264 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. |
| A6264KLPTR-T | 功能描述:IC LED DVR STOP/TAIL 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:* 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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