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参数资料
| 型号： | A6264KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/16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
15
For example, where the required high-level current (FULL =
high) is 90 mA and the required low-level current (FULL = low)
is 20 mA, the resistor values will be:
R REF = 15 = 750 Ω
20
and
R REFH = = 214 Ω
(90 – 20)
These equations completely define the output currents with
respect to the setting resistors. However, for further reference, see
Detailed Description of Regulator Operation section.
It is important to note that because the A6264 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 A6264 may be configured to use fewer than four LED
strings, either by connecting outputs together for higher cur-
rents, or by connecting the output directly to VIN to disable the
regulator for that output. When a regulator is disabled, it will
not indicate an open load and will not affect the fault flag or the
operation of the remaining regulator outputs.
Safety Features
The circuit includes several features to ensure safe operation and
to protect the LEDs and the A6264:
? 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 A6264 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
VIN
A6264
LA1
LA2
LA3
LA4
GND
A. Any LED cathode short
to ground. Current remains
regulated in non-shorted LEDs.
Matching may be affected.
FF is low.
VIN
A6264
LA1
LA2
LA3
LA4
GND
B. Any LAx output short to
ground. Shorted output is
disabled. Other outputs remain
active. FF is high.
VIN
A6264
LA1
LA2
LA3
LA4
GND
C. Current remains regulated.
Matching may be affected. Only
the shorted LED is inactive.
FF is low.
VIN
A6264
LA1
LA2
LA3
LA4
GND
D. Short between LEDs in
different strings. Current
remains regulated. Current
is summed and shared by
affected strings. Intensity match
dependent on voltage binning.
Figure 1. Short circuit conditions.
FF is low.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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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. |
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