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• IC Block Diagrams
IC301 TA2123F
IC302 NJM2185AV
IC703 XC6383C251ML
+
–
+
–
AGC
DET
BST
PWC
PWB
+
–
PWA
+
–
+
–
+
–
+
–
TOMP
RIPPLE
FILTER
MIX
MTL DRV
VREF
PREA
PREB
BEEP
SW
36 35
34
33
32 31
30
29
28 27 26
25
24
22
21
20
19
18
17
16
15
14
13
23
12
11
10
9
8
7
6
5
3
2
1
4
48
47
46
45
44
43
42
41
40
39
38
37
AGC DET
AGC IN
BST NF
BST OUT
PW IN C
LPF
EQ L
PW NF L
PW IN L
PW IN R
PW NF R
EQ R
RF IN
PW GND
PW OUT R
PW OUT C
PW OUT L
VCC
BASE
RF OUT
GND
AMS DET
AMS MIX
AMS IN
VREF IN
PRE GND
M/N SW
PRE SW
F/R SW
BST SW
PW SW
NT SW
AMS OUT
BEEP
MT TC
CAMP SW
AMS IN
PRE NF-R
PRE OUT-R
MTL DRV-R
MTL DRV-L
PRE OUT-L
PRE NF-L
REV IN-L
REV IN-R
REF OUT
FWD IN-R
FWD IN-L
+
–
+
–
BIAS
CIRCUIT
WEIGHT
G2
G1
V/I
ACH BLOCK
GM
SUN
BCH BLOCK (SAME ACH)
14
13
12
11
10
9
8
1
2
3
4
5
6
7
GND
I
REF
V
REF
INB
OUT B
DC B
DET B
Vcc
SW
V
EXT
IN A
OUT A
DC A
DET A
+
–
+
–
CHIP ENABLE
V REF
VDD
2 STEP PFM CONTROL
OSC 100/180 kHz
VLx LIMITER
BUFFER
1
2
3
4
5
CE
V OUT
NC
LX
VSS
