AAT3123 ETC, AAT3123 Datasheet - Page 14

• Manufacturer Part Number: AAT3123
• Description: High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
• Manufacturer: ETC

Additional Application Circuits
14
AAT3124 Driving Two Groups of Paralleled White LED's (e.g. main-LCD & sub-LCD backlights)
V
BATTERY
V
BATTERY
*In some applications, white LED forward voltages (V
for balancing the forward voltage differences. The ballast resistor value may be approximated by the following equation:
C
1µF
IN
EN/SET
C
1µF
AAT3124 Driving High Current Photo-Flash LED
IN
EN/SET
C
1µF
OUT
C
1µF
OUT
V
V
EN/SET
IN
OUT
AAT3124
F
) can vary significantly. Ballast resistors between the LED cathodes and ground are recommended
V
V
EN/SET
GND
IN
OUT
AAT3124
High Efficiency 1X/1.5X Fractional Charge
GND
C1+
C2+
D1
D2
D3
D4
D5
D6
C1-
C2-
R
B
D2
D3
D6
C1+
C1-
C2+
C2-
D1
D4
D5
=
V
SOURCE
Pump for White LED Applications
I
F
Photo Flash LED
- V
C1
1µF
C2
1µF
R
D1
F
B
*
C1
1µF
C2
1µF
R
D2
B
*
R
R
D3
D1
B
B
*
R
R
R
D2
D5
B
D4
B
B
*
Resistor R is optional
Resistor R is optional
Resistor R is optional
R
R
R
D3
D6
D5
B
B
B
*
3123.2003.09.1.1
R
R
D4
D6
B
B
*