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AAT1281IWO-T1

更新时间： 2024-01-23 10:04:10
品牌 Logo 应用领域
思佳讯 - SKYWORKS 驱动接口集成电路
页数 文件大小 规格书
18页 543K
描述
LED Driver

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AAT1281IWO-T1 技术参数

是否Rohs认证： 符合生命周期：Active
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.76
接口集成电路类型：LED DISPLAY DRIVER峰值回流温度（摄氏度）：NOT SPECIFIED
处于峰值回流温度下的最长时间：NOT SPECIFIEDBase Number Matches：1

AAT1281IWO-T1 数据手册

 浏览型号AAT1281IWO-T1的Datasheet PDF文件第5页浏览型号AAT1281IWO-T1的Datasheet PDF文件第6页浏览型号AAT1281IWO-T1的Datasheet PDF文件第7页浏览型号AAT1281IWO-T1的Datasheet PDF文件第9页浏览型号AAT1281IWO-T1的Datasheet PDF文件第10页浏览型号AAT1281IWO-T1的Datasheet PDF文件第11页 
PRODUCT DATASHEET  
AAT1281  
TM  
SwitchReg  
2A Driver IC for High Intensity LED Camera Flash  
Functional Block Diagram  
VIN  
SW  
OUT  
CB  
FLOUTA  
FLOUTB  
POK  
FLEN  
Control  
EN/SET  
RSET CT AGND  
PGND  
FLGND  
be obtained by programming through the AS2Cwire  
interface.  
Functional Description  
The AAT1281 is a high power, 2A Flash LED driver. This  
device utilizes a highly efficient inductive step-up con-  
verter to achieve the desired output voltage (Super  
Capacitor voltage, 5.5V). The current of two output  
channels are regulated evenly and discharged from the  
output Super Capacitor, mainly for camera flash applica-  
tions. The maximum flash current is set by an external  
resistor, RSET, which also sets the maximum movie-mode  
current. The maximum movie-mode current is equal to  
the maximum programmed flash current reduced by the  
flash-to-movie-mode ratio with the default value set to  
1:7.3. A flash pulse is initiated by strobing the FLEN  
input pin low-to-high, which initiates a flash pulse and  
also starts the internal safety timer. The maximum flash  
time is determined by an external timing capacitor con-  
nected to the CT pin. The flash duration can be set from  
50ms up to a maximum of 1s. The flash timer will termi-  
nate the flash current regardless of the status of the  
FLEN pin. This can be either used as a simple flash tim-  
ing pulse or can be used as a safety timer in the event  
of a control logic malfunction to prevent the LEDs from  
over-heating.  
When the AAT1281 is enabled, the step-up convertor  
operates at 2MHz switching and charged up the Super  
Capacitor to 5.5V in seconds. As soon as the Super  
Capacitor reaches 5.5V, the AAT1281 automatically  
changes to light load mode operation to maintain output  
regulation at light load or no load condition. This is dis-  
continuous mode operation, and is normal behavior for a  
switching regulator. At this point, the LEDs are ready to  
be flashed.  
During the flash, the boost engine is shut down, and the  
two LEDs connected to its corresponding current channel  
(FLOUTA or FLOUTB) share the output current supplied  
by the Super Capacitor equally. (The duration of the  
flash will be further discussed in the Applications  
Information section of this datasheet.) In applications  
where only one LED is connected to either FLOUTA or  
FLOUTB, the unused current channel must be directly  
connected to OUT, thereby disabling that channel. For  
the single ultra bright LED application which requires  
doubling the flash current, the two current channels can  
be connected together which allow this ultra bright single  
LED getting the full output current (please check with  
the LED specification from LED suppliers).  
If the safety timer is not needed in the application, it  
can be disabled by connecting the CT pin directly to  
AGND. Further adjustments to the timeout period can  
w w w . a n a l o g i c t e c h . c o m  
8
1281.2008.11.1.1  
1...567891011...18

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