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參數(shù)資料
| 型號： | AAT1270 |
| 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 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 734K |
| 代理商： | AAT1270 |
AAT1270
1A Step-Up Current Regulator for Flash LEDs
12
1270.2007.07.1.0
Flash Timer
The AAT1270A includes a timer circuit that enables
the flash current sinks for a programmed period of
time. This feature eliminates the need for an exter-
nal, housekeeping baseband controller to contain a
safety delay routine. It also serves as a protection
feature to minimize thermal issues with the flash
LEDs in the event an external controller’s flash soft-
ware routine experiences hang-up or freeze.
The flash timeout T can be calculated by the fol-
lowing equation:
Where T is in seconds and C
T
is the capacitance of
the timer capacitor in μF.
For example, using a 47nF capacitor for C
T
sets
the flash timeout to:
The relationship between capacitance of the timer
capacitor and the flash timeout is illustrated in
Figure 2.
Figure 2: Timer Capacitor vs. Flash Timeout.
Flash Timeout (ms)
C
0
5
10
15
20
25
30
35
40
45
50
0
100
200
300
400
500
600
700
800
900
1000
Flash Timeout = 21.5s/μF · 0.047μF = 1s
T = 21.5s/μF · C
T
Timing Diagram
LED CURRENT (0mA)
MOVIE MODE
FLASH
FLASH
FLASH TIMES OUT
SET BY CT
FLASH TIMES OUT
FLASH LOWERED
TO MOVIE-MODE
DURING FLINH
EN/SET
FLASH ENABLE
FLASH INHIBIT
t
DLY(CT)
FLASH LOWERED
TO MOVIE-MODE
DURING FLINH
DATA TO
MOVIE-MODE
LEVEL
FLASH
t
DLY(CT)
FLASH
FLASH
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| AAT1270_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1A Step-Up Current Regulator for Flash LEDs |
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