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參數(shù)資料
| 型號： | AAT3171 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | High Current, High Efficiency Charge Pump with Auto-Timer |
| 中文描述： | 大電流，高效率電荷泵與自動定時器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 382K |
| 代理商： | AAT3171 |
Table 2: Flash/Torch Control Modes.
According to I/O port type, the following equations
can be used to calculate appropriate resistor values.
For an open-drain NMOS I/O port output configu-
ration, the line is pulled low to GND or left floating,
according to state. To calculate the appropriate R
1
and R
2
resistor values, first calculate the R
1
resis-
tor value needed for the desired torch level LED
current:
Next, choose R
2
based on the desired flash level
LED current:
The current and resistance values used in the equa-
tions come from the conditions placed on the I
DX
parameter of the Electrical Characteristics table.
R
1
· 600mA · 187k
Ω
R
1
· I
LED
(flash) - 600mA · 187k
Ω
R
2
=
600mA · 187k
Ω
I
LED
(torch)
R
1
=
EN
ENFL
Mode
0
0
1
1
0
1
0
1
Off
Off
Flash
Torch
AAT3171
High Current, High Efficiency
Charge Pump with Auto-Timer
3171.2007.03.1.1
11
Figure 3: Flash/Torch Control Using the RSET Pin.
AAT3171
EN/SET
C1+
C1-
C2+
C2+
VOUT
F1
2.7V
to 5.5V
EN
Flash
LED
GND
C1
1μF
C
IN
4.7μF
C
OUT
2.2μF
C
T
C2
1μF
RSET
R1
R2
ENFL
CT
ENCT
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