JVC TH-A35, Service Manual

Page: 18 / 22

TH-A35
1-18
2a3020 ( IC 701 ): DC - DC Regulator
LX171/LX1711 ( IC603 ) :
1 . 5 V
Internal
Regulators
Oscillator
40 / 400 KHz
2
2 . 3 0 / 2 . 5 3 V
0 . 7 V
1 u A
3
4
M 2
1 0 o h m
(
V
IN
8
SYNC
7
EN
5 FB
6 COMP
1.22V
Shutdown
Comparator
Frequency
Foldback
Comparator
Error Am plifier
gm = 630uM/Volt
Lockout
Comparator
Current
Sense
Amp llfler
Current
Comparator
G N D
V s w
S B
1
0 . 7 V
S V
C L K
S
R
Q
Q
S l o p e
C o m p e n s a t i o n
S L E E P
V R E F
V 2 5
C N
P V D D
C P
P +
N +
P -
N -
F A O U T
F B K -
F B K +
V D D
IS -
C LO C K
R P W M
C P W M
E A O U T
E A IN
IN A M P O U T
IN P U T -
IN P U T +
M U T E
U V LO
&
R E F E R E N C E
O U T P U T
D R IV E R S
&
LO G IC
F A U LT
T IM E R
5V
R efe re nce
26
4
1
10
C LK
O S C
S Y N C
+
-
22 0m V
P V D D
M U X
M U T E
M U T E
7
14
13
9
11
8
6
5
28
27
25
15
17
F E E D B A C K A M P
E R R O R A M P
C U R R E N T S E N S E
IN P U T A M P
16
24
23
22
21
20
S
R
Q
Q
C LK
5V
R efe re nce
18
Class-D mono power amplifier controller