ViewSonic VE700-1 Service Manual page 32

Add L4 for L1
saturation in
L170E2
+5V L10
3.3uH
C58 C59 D4
Q3
RB060L-40
0.1u/25V 22u/16V
1 6
D D
2 5
D D
NMOS
3 4
G S
SI3434DV
R35
OUT1
10
IN-1
C72 R43
150p 4.7K
C74
E/O1
2200p
Q6
+5V
SI2303DS
2 3
C77 C78
1 L12
0.1u 10u/16V
47uH
R49
OUT2
10
R53
IN-2
10K
C85 R54
100p
4.7K
C86
E/O2
2200p
+5V
U7
IN-2
1
IN-2 E/O3
E/O2 2
E/O2 IN-3
3
Vcc IN-1
OUT2
4
OUT2 E/O1
OUT3
5
OUT3 CT/RT
OUT1 6
OUT1 DTC2
7
GND DTC1/3
8
SCP Vref
C87
0.1u TPS5100
C88
0.22u
SCP time is 112.5ms
+5V
R23
51K
R26
Q1
100K SI2303DS
0.1u/25V
R30 R33
C63 R32
C61 2K
14.7K 1% NC
22u/25V C70
R37
2.2K 1% 4700p/25V
R39
0
R33 10K -> 0
YVEE1
D6
RB400D R47
C80 R48
C79 2K
113K 1%
10u/16V
0.1u C81
4700p
R52
11K 1%
+1.25V
E/O3 R58 R59
16
15 IN-3 +1.25V
IN-1 7.5K 1% 7.5K 1%
14
E/O1
13
12
11
10
9
C89 C90 R62 C91 R63
0.1u 0.22u
20K 1% 20K 1%
1u
Max Duty=83% PWM Frequency about 550KHz
ViewSonic Corporation
AVDD_+9.6V
IAVDD
typ. 320 mA(rms)
max. 640 mA(rms)
AVDD1 C192
R25
0.1u/25V
0
L11
R28 100uH
0
C66 C60
100u/25V 0.1u/25V
R36
OUT3
10
IN-3
C73
100p
C75
E/O3
2200p
YVEE_-4.95V -4.95V IYVEE
R46
typ. -5mA(rms)
max. 10mA(rms)
0
C194
0.1u/25V
+5V
C82 C83
0.1u/25V 10u/16V
R56
NC
Q7
3
DTA124TUA
V+3.3V
R61
12K
R64 C92
7.5K 1% 120p
1
C93 R65
1u 4.7K
29
Confidential – Do Not Copy
C57
0.1u/50V 1u/25V
D5
RB400D C68 R31
3 C67 R34
2K
Q4 82K 1%
2N7002E C71
1
2 R38 4700p/50V
1u/50V 4.3K 1%
R40
1K 1%
R44
4.7K
for YV1
discharge
for power-on YV1
overshoot
U6
AIC1117-adj
F2
R50
3 2
INPUT OUTPUT
4
SINK
1A 0
C84
R51
22u/16V
620 1%
R55
1.02K 1%
+1.25V
2
R57
1
100K
R60
10K
3
Q8
2SC3325
2
Title
DC-DC(2)
Size Document Number
S1
Custom
Date: 03:58:10
VE 00-1
VA720-2
AVDD_+9.6V
R24
IYV1
100K
typ. 5mA(rms)
YV1 max.
+25.09V
10mA(rms)
R27
1
47K YV1_+25.09V
R29
3
2
Q2 0
SI2303DS C193
C69
0.1u/25V
4.7u/50V
R41 R42
4.7K 5%
68K 5%
Q5 3
2SC4519
1
2
R45
C76
0.1u/25V AVDD_+9.6V
39K 5%
V+3.3V
IV33
typ. 35mA(rms)
max. 70mA(rms)
QPWB-5408T8---C
Rev
C
Sheet 3 of 9