SCH01 Bar MAIN SYS POWER
SCHEMATIC DIAGRAMS
POWER IN
DCDC 3V9
DCDC 5V1
DCDC 3V3
VOUT=0.6*(1+R10/R14)=5.1v
Vin
：
2.5V<Vin<5.5V
Vout=0.6*(1+R11/R12)=3.32V
01UBUCK1-SY80882
VOUT=0.6*(1+R3/R6)=3.93v
USB 5V
SYS_3V3
STB_3V3
STB5V1
POWER_15V
STB5V1
AMP_VCC
STB3V9
POWER_15V
POWER_15V
SYS_3V3
STB_3V3
USB_5V
STB5V1
FR+
FR-
MT8516_POWER
OTG_PWR_EN
SYS_POWER_CTL
R6
18K/1%
R258
10K
R4
NC/1K
U5
JW7115-2
VIN
5
FLG
3
EN
4
VOUT
1
GND
2
R11
68K/1%
C8
N
C
/0
.1u
F/1
6V
/X7
R
U1
SY8120I
BST
1
GND
2
FB
3
EN
4
VIN
5
SW
6
R10
150K/1%
R14
20K/1%
C3
10
uF
/25V
/X5
R
R12
15K/1%
R13
100K
U3
SY8120I
BST
1
GND
2
FB
3
EN
4
VIN
5
SW
6
R1
0
Ω
/0603
C10
22pF/50V/NP0
R9
390K
C12
10UF/6.3V/X5R
R5
100K
+
N
C
/47
uF
/6
.3
V
CE2
L3
2.2uH/2.1A
R7
0
Ω
/0402
R17
1K
C16
10
uF
/10V
/X5
R
C13
10
uF
/25V
/X5
R
C2
22
0p
F/50
V/N
P0
R2
390K
C14
10
0n
F/25
V/X
5R
C18
N
C
/0
.1u
F/1
6V
/X7
R
C9
0.1uF/16V/X7R
U2
SY8088I
EN
1
VIN
4
LX
3
VFB
5
G
ND
2
C19
0.1uF/16V/X7R
C5
10
U
F/6
.3
V/X5
R
C15
10
uF
/10V
/X5
R
C4
10
0n
F/25
V/X
5R
R8
0
Ω
/0603
R18
NC/10K
C7
100nF/25V/X5R
L2
3.3uH/3.4A
R16
1K
C6
10
U
F/6
.3
V/X5
R
R15
NC/10K
C20
0.1uF/16V/X7R
R3
100K/1%
U4
JW7115-2
VIN
5
FLG
3
EN
4
VOUT
1
GND
2
XP1
6PIN/2.5mm
1
1
2
2
3
3
4
4
5
5
6
6
C11
22
0p
F/50
V/N
P0
L1
4.7uH/2A
C17
4.7UF/10V/X5R
C1
0.1uF/16V/X7R
9
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
