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AAT1270

更新时间： 2022-04-23 23:00:11
品牌 Logo 应用领域
ANALOGICTECH 调节器闪光灯
页数 文件大小 规格书
18页 725K
描述
1A Step-Up Current Regulator for Flash LEDs

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AAT1270 数据手册

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AAT1270  
1A Step-Up Current Regulator for Flash LEDs  
Functional Block Diagram  
IN  
OUT  
SW  
FLOUTA  
FLOUTB  
EN/SET  
FLEN  
Control  
FLINH  
200kΩ  
RSET CT AGND  
FLGND GND  
PGND  
to a maximum of 1s. The flash timer will terminate  
the flash current regardless of the status of the  
FLEN pin. This can be either used as a simple flash  
timing pulse or as a safety timer in the event of a  
control logic malfunction to prevent the LED from  
over-heating. If the safety timer is not needed in the  
application, it can be disabled by connecting the CT  
pin directly to AGND.  
Functional Description  
The AAT1270 is a boost converter with a current  
regulated output designed to drive high current  
white LEDs used in flash/movie light applications.  
The maximum flash current is set by an external  
resistor, RSET, which not only sets the flash current  
but also sets the maximum movie mode current  
reduced by a factor of 7.3. A flash pulse is initiated  
by switching the FLEN (flash enable) pin from low to  
high, which initiates the flash pulse and also starts  
the internal timer. The maximum flash time is deter-  
mined by an external timing capacitor connected to  
the CT pin. The flash duration can be set from 50ms  
For applications using two flash LEDs, each diode  
can be connected to its corresponding current sink  
(FLOUTA or FLOUTB) and the output current will be  
equally shared. In single flash LED applications, the  
two current sinks can be connected together to  
apply the full output current into the LED.  
1270.2007.07.1.0  
9
1...6789101112...18

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