SCH19 Subwoofer POWER&AUDIO Power Supply
19V/1.8A
01UBUCK2-T542021
EN: 1.28V<=EN<7V
Vout= 0.596*(R_1+R_2)/R_2
3.3V /2A OUT
Vin
:
4.5V<Vin<28V
R_1
R_2
VCC1
FB
FB
P
P
P
19V
POWER_18V
STB_3V3
D
POWER_18V
PVDD
STB_3V3
SYS_3V3
POWER_18V
19V
D
P
D1
RS1M
R34
13K
C
97
3
10
uF
/10
V/X
5R
D7
L5
6.8uH/3A
R2
2.74M
R27
1.2K/
R25
22K/1%
C
10
0.1
uF
/50
V/X
7R
R24
0.68
D3 RS1M
C
7
100p
F/100V
/X7
R
TR3
5
R20
10K
F1
FUSE_3.15AL/250V
U5
TPS54202DDCR
VIN
3
EN
5
GND
1
FB
4
BST
6
SW
2
R35 10K
C
3
0.0
1u
F/6
30
V
R10
22
R22
0.68
U2
EL1018
1
2
4
3
R9
22
+
100uF/25V
CE2
R14
100K/1%
C15
100pF/50V/NP0
R23
0.68
C9
2200pF/630V
C
4
0.1u
F/50
V/X
7R
C
97
4
1u
F/25V
/X7
R
R13
56
0K
Ω
/±
5%
C12 0.1uF/50V/X7R
C20
1u
F/
35V
/X5
R
R3
2.74M
C11
270pF/50V/NP0
R29
62
+
10uF/50V
CE10
R18 33
Q1
G
D
S
R38
100K
R31
2.2K
R4
2.74M
R28
62
D4
BAS316/100V/0.5A
M
T1
SG8004
1
1
5
5
6
6
3
3
9
9
8
8
7
7
10
10
4
4
FB20
600/2A
+
C
E5
47
0u
F/
25
V
R19 100
C21
10
0n
F/
25
V/
X5
R
D6
BAS316/100V/0.5A
R30
2.2K
C
X1
0.3
3u
F/27
5VA
C
D5
1
2
3
C5
300pF/50V/NP0
+
C
E4
47
0u
F/
25
V
R37
22
R8
150K
C
2
0.0
1u
F/6
30
V
STB_3V3
C14
LF2
200uH
2
3
1
4
U1
GND
1
FB
2
GATE
6
RT
3
VDD
5
SENSE
4
LF1
FT15/13mH
2
3
1
4
CY1
1000pF/250VAC
TR2
100K
R32
51.1K/1%
ZD1
U3
TL431ACLP
3
1
2
CN1
2PIN/7.92mm
1
1
2
2
-
+
BD1
KBP306
2
1
3
4
+
68uF/400V
CE1
R15 10
R21 330/1%
C191
100nF/16V/X5R
C1
2200pF/630V
HS1
1
2
R33
20K
C
97
2
10u
F/1
0V
/X
5R
R6 270K
R1
2.74M
R26
100k
C18
N
C
/10
0p
F/50
V/N
P0
R7 4.7
27
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This Unit
Electrical
Mechanical
Repair Information
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