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參數(shù)資料
| 型號(hào)： | AAT1270IFO-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1A Step-Up Current Regulator for Flash LEDs |
| 中文描述： | 第1A升壓電流調(diào)節(jié)器的閃光燈發(fā)光二極管 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 734K |
| 代理商： | AAT1270IFO-T1 |
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AAT1270
1A Step-Up Current Regulator for Flash LEDs
1270.2007.07.1.0
9
Functional Block Diagram
SW
PGND
FLOUTA
AGND
Control
RSET
IN
CT
FLOUTB
FLGND
OUT
EN/SET
FLEN
FLINH
GND
200k
Ω
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, R
SET
, 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
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.
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.
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