24
6-13. IC BLOCK DIAGRAMS
– MAIN Board –
TDA7296
THERMAL
SHUTDOWN
BIPOLAR
TRANSCONDACTANCE
INPUT STAGE
STANDBY/
MUTE
BOOST-
STRAP
MOS GAIN &
LEVEL SHIFTING
STAGE
STBY
-GND
IN–
IN+
IN+ MUTE
NC
BOOSTSTRAP
+VS
–VS
STBY
MUTE
NC
NC
+PWVS
OUT
–PWVS
14 15
12
13
10
11
8 9
6
7
5
3
4
1 2
+
–
MOS
OUTPUT
STAGE
SHORT
CIRCUIT
PROTECTION
VOLUME
TREBLE
MIDDLE
BASS
ATTENUATOR
MULTIPLEXER
GAIN AMP
SDA
CREF
VS
AGND
ROUT
LOUT
SCL
DIG GND
TREBLE (R)
TREBLE (L)
MIN (L)
MOUT (L)
BOUT (L)
BIN (L)
BOUT (R)
BIN (R)
MOUT (R)
MIN (R)
INR
1
2 3 4
5
6
R-IN4
R-IN3
7
8
R-IN2
R-IN1
9
10
MULTIPLEXER
GAIN AMP
L-IN1
L-IN2
11 12
L-IN3
L-IN4
13 14
MUX OUT (L)
15
18
VOLUME
TREBLE
MIDDLE
BASS
SPEAKER
ATTENUATOR
INL
MUX OUT (R)
16
17
27
28
29
30
22 21 20 19
26 25 24 23
GND
OUT1
VCTL
VZ1
VZ2
IN1
IN2
VCC1
VCC2
OUT2
5
6
7
8 9 10
1
2 3
4
DRIVER OUT
PRE DRIVER
LOGIC
SWITCH
TSD
BIAS
8
7
6
5
1
2
3
4
2CH
1CH
VCC
OUT2
–IN2
+IN2
OUT1
–IN1
+IN1
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