- 您现在的位置：买卖IC网 > Datasheet目录306 > A6261KLPTR-T (Allegro Microsystems Inc)IC LED ARRAY DVR 400MA 16-TSSOP Datasheet资料下载
参数资料
| 型号： | A6261KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LED ARRAY DVR 400MA 16-TSSOP |
| 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 |
| 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1360-6 |
A6261
? 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.
Protected LED Array Driver
the voltage above which the LED current drops below the accept-
able minimum.
This can be estimated by determining the maximum power that
can be dissipated before the internal (junction) temperature of the
A6261 reaches T JM .
Note that, if the thermal monitor circuit is disabled (by connect-
ing the THTH pin to GND), then the maximum supply limit will
be determined by the specified maximum continuous operating
P D (max) =
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
temperature, 150°C.
The maximum power dissipation is therefore defined as:
? T
R θ JA
(12)
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
always be greater than this value and the minimum specified sup-
ply voltage, that is:
V IN > V DO + V LED , and
V IN > V IN (min) (11)
As an example, consider the configuration used in figures 6 and 7
above, namely 4 strings of 3 red LEDs, each string running at
50 mA, with each LED forward voltage at 2.3 V. The minimum
supply voltage will be approximately:
V IN (min) = 0.55 + (3 × 2.3) = 7.45 V
Maximum Supply Limit: Thermal Limitation As described
above, when the thermal monitor reaches the activation tempera-
ture, T JM (due to increased power dissipation as the supply volt-
age rises), the thermal foldback feature causes the output current
to decrease. The maximum supply voltage is therefore defined as
where Δ T is difference between the thermal monitor activa-
tion temperature, T JM , of the A6261 and the maximum ambient
temperature, T A (max), and R θ JA is the thermal resistance from the
internal junctions in the silicon to the ambient environment.
If minimum LED current is not a critical factor, then the maxi-
mum voltage is simply the absolute maximum specified in the
parameter tables above.
Application Examples
In some filament bulb replacement applications the supply may
be provided by a PWM-driven, high-side switch. The A6261 can
be used in this application by simply connecting EN to VIN.
If neither fault action nor fault reporting is required, then FF
should be tied to ground.
When power is applied there will be a short startup delay, t ON ,
before the current starts to rise. The current rise time will be lim-
ited by the internal current slew rate control.
The application circuit options in figure 9 show operation with
a higher voltage supply and with combinations of outputs tied
together and disabled.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
相关PDF资料 |
PDF描述 |
|---|---|
| A6262KLPTR-T | IC LED ARRAY DRIVER AUTO 16TSSOP |
| A6264KLPTR-T | IC LED DVR STOP/TAIL 16-TSSOP |
| A6265KLPTR-T | IC LED CTLR HI CURRENT 16-TSSOP |
| A6266KLPTR-T | IC LED CTLR AUTO HI CURR 16TSSOP |
| A6267KLPTR-T | IC LED CTLR AUTO HI CURR 16TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A6261KLYTR-T | 功能描述:IC LED ARRAY DVR 400MA 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 |
| A6262 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6262 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. |
| A6262KLPTR-T | 功能描述:IC LED ARRAY DRIVER AUTO 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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。