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AAT3119 Datasheet(PDF) 14 Page - Advanced Analogic Technologies

Part # AAT3119
Description  High Efficiency 2X Charge Pump
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT3119 Datasheet(HTML) 14 Page - Advanced Analogic Technologies

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AAT3119
High Efficiency 2X Charge Pump
14
3119.2005.08.1.1
If a "light" or "movie" mode is also needed along
with the flash function, this can be accomplished
with the addition of a second ballast resistor with a
flash function gating MOSFET switch as shown in
Figure 3. Refer to the following equations for the
calculation of flash and light resistors, RF and RL.
Where:
RL
=
Light mode ballast resistor value in
ohms (Ω)
VOUT = Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current in
the "light" mode
Where:
RF
=
Flash ballast resistor value in ohms (Ω)
RDS = Flash gating MOSFET on resistance
VOUT = Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current
R
F =
- R
DS
(V
OUT - VF)
I
F
R
L =
(V
OUT - VF)
I
F
Figure 2: Flash LED Application.
AAT3119
IN
GND
EN
OUT
4.5V
COUT
C
IN
R
F
1µF
1µF
1µF
C
FLY
V
IN
Enable
Flash LED


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