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參數(shù)資料
| 型號： | AAT3174IWP-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Current, High Efficiency Charge Pump |
| 中文描述： | 大電流，高效率電荷泵 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 285K |
| 代理商： | AAT3174IWP-T1 |
Application Information
Flash/Torch Control Using the RSET Pin
An alternative method can be used for flash/torch
control that eliminates the need to use the S
2
Cwire
single-wire interface. By using any typical digital
I/O port, an additional enable can be created (see
Figure 1).
The I/O port output configuration can be any one of
open-drain NMOS, open-drain PMOS, or push-pull
type. The control will always act as an active-low
flash enable or, equivalently, an active-high torch
enable (see Table 2).
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
AAT3174
High Current, High Efficiency Charge Pump
10
3174.2006.05.1.2
Figure 1: Flash/Torch Control Using the RSET Pin.
AAT3174
EN/SET
VIN
C1+
C1- C2+
C2-
VOUT
F1
2.7V
to 5.5V
EN
Flash
LED
GND
C
IN
4.7μF
C
1
1μF
C
2
1μF
C
OUT
2.2μF
R1
R2
RSET
ENFL
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