2A3020 ( Ic 701 ): Dc - Dc Regulator; Class-D Mono Power Amplifier Controller - JVC TH-A35 Service Manual

TH-A35

2a3020 ( IC 701 ): DC - DC Regulator

2
V
IN
Internal
Regulators
8
SYNC
7
EN
Frequency
Foldback
Comparator
LX171/LX1711 ( IC603 ) :

Class-D mono power amplifier controller

V D D
25
IS -
27
C LO C K
28
R P W M
5
C P W M
6
E A O UT
14
E A IN
13
IN A M P O U T 9
IN P U T -
8
IN P U T +
7
M UT E
11
1-18
C o m p e n s a t i o n
Oscillator
C L K
40 / 400 KHz
Shutdown
Comparator
0 . 7 V
1 u A
2 . 3 0 / 2 . 5 3 V
Lockout
Comparator
0 . 7 V
1.22V
Error Am plifier
gm = 630uM/Volt
5 FB
P V D D
+
-
S Y N C
O S C C LK
C U RR E N T S E N S E
E R R O R A M P
M U T E
M UX
IN P U T A M P
M U T E
Current
Sense
S l o p e
Amp llfler
Current
Comparator
1 . 5 V
6 COMP
U V LO
&
R E F E R E N C E
220m V
F A U LT
T IM E R
S Q
C LK R Q
F E E D B A C K A M P
S V
S Q
R Q
S LE E P
10
V R E F
1
V 25
4
5V
18 C N
R eference
P V D D
24
5V
C P
26
R eference
23 P +
O U T P U T
22 N +
D R IV E R S
&
LO G IC 21 N -
20 P -
F A O U T
15
F B K -
17
F B K +
16
S B
1
(
3 V s w
M 2
1 0 o h m
G N D
4