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LCM Backlight LED driver schematic
LED Driver SKT
VBAT
3
DAC/LIGHT_CTRL
2
IO1/CSTN_LEDEN
LM3501 is a fixed operating frequency (1MHz) step-up DC/DC converter which can drive up to 3
white leds in series. The white LED current is set by the following equation: Iled =
0.197*Vctrl/RB169, in which Vctrl is the voltage of pin CTRL.
6.6 Camera Module
DSC connector @ MB side
10
LSPKR
10
LSPKL
7
PTD0/nRES_DSC
VRIO
7
VIOD[0:7]
VIOD7
VIOD6
VIOD5
VIOD4
VIOD3
VIOD2
VIOD1
VIOD0
CN2
BGND
Technical Documentation
TTD_Repair_L3 _Theory of Operation_E61_R1.0.pdf
BL1
BLM18RK102SN1
BGND
24
23
22
21
0
RB454
20
19
18
17
16
DSC.DOVDD
15
14
13
AXK824145Y
CN3
BGND
BGND
BGND
LB2
33uH
BLDRV
B1
C2
VIN
VSW
A3
C1
CTRL
VOUT
LM3501
A2
B3
/SD
FB
C3
A1
GND
AGND
LM3501 White LED Driv er
74.03501.040
I_LED = ( 0.191 *
TPL27 TPL28
DSC
1
GND
GND
2
LSPKR
HREF
3
LSPKL
VSY NC
4
GND
XCLK
5
RESET
PCLK
6
DSC.AVDD
Y 7
AVDD(2V5)
7
DSC.DVDD
Y 6
DVDD(1V8)
8
Y 5
SIO_D
9
Y 4
PWDN
10
DOVDD
SIO_C
11
Y 3
Y 0
12
Y 2
Y 1
AXK734245-24
BGND
RB166 0
BGND
Vctrl ) / R17
TPL25
TPL26
0
RB457
0
RB458
CN1
BGND
Page 24 of 33
Release 1.0
LED+ 11
LED- 11
VIO_HD 7
VIO_VD 7
VIO_CLKOUT 7
VIO_CLK 7
VDSCA
VDSCC
IIC_SDA 7
PTG2/PWDN_DSC 7
IIC_SCL 7
06/2006
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