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3. TECHNICAL BRIEF
3.9 LCD back-light illumination
The AS3675 is a highly-integrated CMOS Power and Lighting Management Unit for operating with
lithium-ion/polymer batteries. And AS3675 support 13 Current sinks, the RGB and white LEDs. The
AS3675 is capable of driving up to three LEDs at a total of 500mA. The current sinks may be operated
individually or in parallel for driving higher current LEDs. To maximize power efficiency, the charge
pump operates in 1X, 1.5X, or 2X mode, where the mode of operation is automatically selected by
comparing the forward voltage of each LED with the input voltage.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 12 LCD Back light unit and Flash LED charge pump IC
CHARGE PUMP
2.2u
C118
1u
C117
1V8_CAM
A2
VBAT
C4
C3
VSS
B2
VSS_CP
CURR31
CURR32
E3
CURR33
D3
CURR41
C1
E1
CURR42
D1
CURR43
E4
CURR6
DATA
A6
DCDC_FB
D6
DCDC_GATE
B5
DCDC_SNS
C6
A1
GPIO
D2
RGB1
RGB2
E2
C2
RGB3
E6
V2_5
VANA_GPI
U101
AS3675
B1
AUDIO_IN
C1_N
B3
C1_P
A4
A3
C2_N
B4
C2_P
CLK
B6
A5
CP_OUT
E5
CURR1
D5
CURR2
C5
CURR30
D4
1u
C112
1u
C111
1u
C115
VBAT
1u
C113
2.2u
C116
AUDIO_IN
LED2
LED3
LED4
LED5
LED6
PHOTO_ADC_IN
SCL
MLED
MLED5
MLED1
MLED2
MLED3
MLED4
SDA
LED1
Содержание KF350
Страница 1: ...Service Manual Model KF350 Service Manual KF350 Date October 2008 Issue 1 0 Internal Use Only ...
Страница 127: ... 128 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 174: ...Note ...
Страница 175: ...Note ...