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参数资料
| 型号： | A6262KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/15页 |
| 文件大小： | 0K |
| 描述： | IC LED ARRAY DRIVER AUTO 16TSSOP |
| 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，通用 |
| 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： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1362-6 |
A6262
Automotive LED Array Driver
Functional Description
(1)
I LAx =
TheA6262 is a linear current regulator that is designed to pro-
vide drive current and protection for parallel strings of series-
connected high brightness LEDs in automotive applications. It
provides up to four matched programmable current outputs at
up to 100 mA, with low minimum dropout voltages below the
main supply voltage. For 12 V power net applications, optimum
performance is achieved when driving 4 strings of 1 to 3 LEDs,
at current up to 100 mA per string.
The A6262 is specifically designed for use in internal illumina-
tion applications where the LED activity is controlled by a PWM
signal, by a logic signal, or by a push-to-make, ground-connected
switch.
Current regulation is maintained and the LEDs protected during a
short to ground at any point in the LED string. A short to ground
on any regulator output terminal will disable that output until the
short is removed. Open load on any output will be ignored.
Integrated thermal management reduces the regulated current
LA[1:4] Current source connected to the anode of the first LED
in each string. Connect directly to VIN to disable the respective
output. In this document “LAx” indicates any one of the outputs.
LED Current Level
The LED current is controlled by a matching linear current regu-
lator between the VIN pin and each of the LAx outputs. The basic
equation that determines the nominal output current at each LAx
pin is:
Given EN = high,
K
R REF
where I LAx is in mA and R REF is in k Ω ; K is 15.
The output current may be reduced from the set level by the ther-
mal monitor circuit.
Conversely the reference resistors may be calculated from:
level at high internal junction temperatures to limit power dis-
sipation.
R REF =
K
I LAx
(2)
Pin Functions
VIN Supply to the control circuit and current regulators. A small
value ceramic bypass capacitor, typically 100 nF, should be con-
nected from close to this pin to the GND pin.
where I LAx is in mA and R REF is in k Ω .
For example, where the required current is 90 mA for all four
channels the resistor value will be:
GND Ground reference connection. Should be connected directly
to the negative supply.
R REF = 15
90
= 167 Ω
EN Logic input to enable LED current output. This provides a
direct on/off action and can be used for direct PWM control. The
EN input overrides the SW input when EN is high. When EN
transitions from high to low, SW input logic is reset to off.
SW Logic input to toggle LED current output on and off. A
single push-to-make switch between SW and GND will provide
push-to-make/push-to-break, on/off toggle action. The SW input
is debounced by typically 30 ms and is internally pulled to typi-
cally 3 V, with approximately 100 μ A.
IREF 1.2 V reference to set current reference. Connect resistor,
R REF , to GND to set reference current.
THTH Sets the thermal monitor threshold, T JM , where the output
current starts to reduce with increasing temperature. Connecting
THTH directly to GND will disable the thermal monitor function.
It is important to note that because the A6262 is a linear regu-
lator, the maximum regulated current is limited by the power
dissipation and the thermal management in the application. All
current calculations assume adequate heatsinking for the dissi-
pated power. Thermal management is at least as important as the
electrical design in all applications. In high current high ambient
temperature applications the thermal management is the most
important aspect of the systems design. The application section
below provides further detail on thermal management and the
associated limitations.
Operation with Fewer LED Strings or Higher Currents
The A6262 may be configured to use fewer than the maximum
quantity of LED strings: by connecting outputs together for
higher currents, by leaving the outputs open, or by connecting the
output directly to VIN to disable the regulator for that output.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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| 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 |
| A62635-000 | 制造商:TE Connectivity 功能描述:TP-FIREST-0.750 - Bulk |
| 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. |
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