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AAT3131 Datenblatt(PDF) 13 Page - Advanced Analog Technology, Inc.

Teilenummer AAT3131
Bauteilbeschribung  High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
PDF  14 Pages
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Hersteller  AAT [Advanced Analog Technology, Inc.]
Direct Link  http://www.aatech.com.tw
Logo AAT - Advanced Analog Technology, Inc.

AAT3131 Datenblatt(HTML) 13 Page - Advanced Analog Technology, Inc.

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Figure 2: AAT3131 Driving Two Groups of Paralleled White LEDs
(e.g., main LCD and sub-LCD backlights).
C
IN
1
µF
V
BATTERY
C
OUT
1
µF
EN/SET
C1
1
µF
C2
1
µF
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3131
D2
D3
D4
D1
RB*RB*RB*RB*
D5
D6
RB*RB*
*In some applications, white LED forward voltages (VF) can vary significantly. Ballast resistors between the LED cathodes and ground are recommended
for balancing the forward voltage differences. The ballast resistor value may be approximated by the following equation:
RB =
VSOURCE - VF
IF
AAT3131
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
3131.2005.12.1.2
13



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