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1.6. DC to DC converter circuit – SI-8008
Because the PW318C is need a lot of power for its core (1.8V) and memory (2.5V). We
use the DC to DC converter SI-8008 to provide the function which is converted the 5Vs to 1.8Vs
and 3.3Vs. And 2.5Vs is generated from 3.3Vs by low drop output regulator.
+15VIN
+5VAIN
J13
1
2
TP170
3
4
5
6
TP171
7
8
TP172
9
10
11
12
TP173
13
14
15
16
TP174
17
18
19
20
7
E_PWM
21
22
2K62098211
U22
+15V
L61 Z220
SI-8008TM-TL
R295
0
1
IN
+
C328
220U 25V
<Spec>
GND_POWER
B
Q22
C333
2,9
PWR_ON
R254
10K
2N3904S
1U K
GND_POWER
GND_POWER
U24
+5VS
L65 Z220
SI-8008TM-TL
1
IN
C334
+
220U 25V
<Spec>
C340
GND_POWER
1U K
GND_POWER
2. Video Board
2.1. Overview
1. The Video Board includes Composite input*2, S-video input*2, Component input*2,
Audio input(L/R)*2, Line output(L/R)*1, SPDIF output *1, PAL Tuner (F-type
connector).
2. The Video Board inputs (included S-video, Composite video, Component video) will be
processed by the video decoder(SAA7117/AE on main board), then processed by
PW318C. All of video inputs can accept NTSC, PAL and SECAM signals.
2.2 Audio and Video switch circuit – CXA2069
CXA2069 is an Audio/Video multiplexer IC. The chip is programmed by means of an I2C
DC to DC convert Circuit
(2.5A, 0.04 OHM, 0805)
L98
Z200
L99
Z200
+12V
L55
Z200
L57
Z200
L58
Z200
+5VSIN
L59
Z200
L60
Z200
C316
+
C322
C319
C320
C321
0.1U K
0.1U K
0.1U K
0.1U K
220U 16V
TP175
R247
0
LCD_BR
TP176
R248
100
PWR_ON 2,9
TP177
R249
100
LCD_ON 9
C325
C326
C327
220P J
220P J
220P J
(For EMI)
2
L62
SW
33U K
D6
R250
8.2K
SS24-LF
+
C329
220U 16V
<Spec>
R252
180
820 ohm
R255
620 J
Vo=Vadj * (R1+R2) / R2
2
L66
L91
SW
33U K
D8
R256
2.4K
SS24-LF
+
C335
+
C407
47U 16V
22U 16V
R326
<Spec>
<Spec>
100
R257
180
R324
620 J
+15V
+5VA
C403
+
C404
C317
+
C323
C318
0.1U K
0.1U K
220U 25V
220U 16V
220U 16V
7
+9V
U23
+5VS
L89
Z80
L63 Z220
SI-8008TM-TL
1
IN
+
C330
+
C405
220U 25V
22U 16V
<Spec>
<Spec>
C332
GND_POWER
1U K
GND_POWER
+3.3VS
Z80
U25
+3.3VS
L67 Z220
1
3
IN
OUT
C336
+
G953-25T6UF
10U M
16V
108
+5VS
+
C324
0.1U K
2
L64
L90
SW
33U K
D7
R251
1K
SS24-LF
+
C331
+
C406
47U 16V
22U 16V
<Spec>
<Spec>
R253
180
R325
620 J
+2.5VS
L101
Z80
+
C337
220U 16V
C339
0.1U K
+1.8VS
Z80
L87
Z80
L88
Z80
GND_POWER
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