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参数资料
| 型号： | A6264KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/16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
in the voltage drop across the LEDs, as a result of the short, the
current matching in the A6264 may exceed the specified limits.
A short between LEDs in different strings (figure 1D) will not
result in a short fault condition. The current through the remain-
ing LEDs will remain in regulation and the LEDs will be pro-
tected. The current will be summed and shared by the affected
strings. Current matching in the strings will then depend on the
LED forward voltage differences.
Open Load Detection An open load condition is detected
when the voltage across the regulator, V IN – V LAx , is less than
the open load detect voltage, V OCD , but greater than the output
disable threshold voltage, V ODIS . When this condition is present
for more than the open load detect time, t OCD , then all regulators
will be disabled and the fault flag allowed to go high.
The regulators will remain disabled until either the power is
cycled off and on, or the fault flag, FF, is pulled low. If the power
is cycled, the regulators will start in the enabled state, unless
disabled by tying the output to VIN, and the open load detection
timer will be reset. If the open load is still present the regulators
will again be disabled after the open load detect time.
Pulling the fault flag low will override the open load fault action
and all enabled regulators will be switched on. This state will
be maintained while the fault flag is held low. If the fault flag is
allowed to go high the A6264 will return to the open load fault
condition and will disable all regulators.
Each of the four regulators includes a limiter to ensure that
the output voltage will not rise higher than the output disable
threshold voltage below VIN when driven by the regulator. This
means that the voltage across the regulator will not be less than
the output disable voltage, unless it is forced by connecting the
mounting the A6264 on the same thermal substrate as the LEDs,
this feature can also be used to limit the dissipation of the LEDs.
As the junction temperature of the A6264 increases, the regulated
current level is reduced, reducing the dissipated power in the
A6264 and in the LEDs. The current is reduced from the 100%
level at typically 4% per degree Celsius until the point at which
the current drops to 25% of the full value, defined at T JL . Above
this temperature the current will continue to reduce at a lower
rate until the temperature reaches the overtemperature shutdown
threshold temperature, T JF . The temperature at which this effect
begins is defined as the thermal monitor activation temperature,
T JM , and is specified, in the characteristics table, at the 90% cur-
rent level.
In extreme cases, if the chip temperature exceeds the overtem-
perature limit, T JF , all regulators will be disabled. The tempera-
ture will continue to be monitored and the regulators re-activated
when the temperature drops below the threshold provided by the
specified hysteresis.
Note that it is possible for the A6264 to transition rapidly
between thermal shutdown and normal operation. This can hap-
pen if the thermal mass attached to the exposed thermal pad is
small and T JM is increased to close to the shutdown temperature.
The period of oscillation will depend on T JM , the dissipated
power, the thermal mass of any heatsink present, and the ambient
temperature.
100
90
80
LAx pin to VIN. However if a load becomes disconnected, the
regulator will pull the LAx pin up to the limit, which will ensure
60
T JM
that the voltage across the regulator, V IN – V LAx , is less than the
open load detect voltage, V OCD .
Note that an open load may also be detected if the sum of the for-
ward voltages of the LEDs in a string is close to or greater than
40
25
20
T JL
T JF
the supply voltage on VIN.
0
70
90 110
130
150
170
Temperature Monitor A temperature monitor function,
included in the A6264, reduces the LED current as the silicon
junction temperature of the A6264 increases (see figure 2). By
Junction Temperature, T J (°C)
Figure 2. Temperature monitor current reduction.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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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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