21
X-EM21V
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.4 IC INFORMATION
6. SERVICE MODE
There is no information to
b
e sho
w
n in this chapter.
(TDA7491HV)(MAIN ASSY: IC302)
20 W + 20 W dual BTL class-D audio amplifier
• Block Dia
g
ram
• Pin Function
No
Name
Type
Description
1
SUB_G
N
D
POWER
Connect to the frame
2,3
OUTPUTB
OUT
Positive PWM for right channel
4,5
PG
N
DB
POWER
Power stage round for right channel
6,7
P
V
CCB
POWER
Power supply for right channel
8
,9
OUT
N
B
OUT
N
egative PWM output for right channel
10,11 OUT
N
A
OUT
N
egative PWM output for right channel
12,13 P
V
CCA
POWER
Power supply for left channel
14,15 PG
N
DA
POWER
Power stage round for left channel
16,17 OUTPA
OUT
Positive PWM output for left channel
1
8
PG
N
D
POWER
Power stage round
19
V
DDPW
OUT
3.3
V
(nominal) regulator output referred to ground for power stage
20
STBY
I
N
PUT
Standby mode control
21
MUTE
I
N
PUT
Mute mode control
22
I
N
PA
I
N
PUT
Positive differential input of left channel
23
I
NN
A
I
N
PUT
N
egative differential input of left channel
24
ROSC
OUT
Master oscillator frequency-setting pin
25
SY
N
CLCK
I
N
/OUT
Clock in/out for external oscillator
26
V
DDS
OUT
3.3
V
(nominal) regulator output referred to ground for signal blocks
27
SG
N
D
POWER
Signal ground
2
8
DIAG
OUT
Open-drain diagnostic output
29
S
V
R
OUT
Supply voltage rejection
30
GAI
N
0
I
N
PUT
Gain setting input 1
31
GAI
N
1
I
N
PUT
Gain setting input 2
32
I
N
PB
I
N
PUT
Positive differential input of right channel
33
I
NN
B
I
N
PUT
N
egative differential input of right channel
34
V
REF
OUT
Half
V
DDS (nominal) referred to ground
35
S
V
CC
POWER
Signal power supply
36
V
SS
OUT
3.3
V
(nominal) regulator output referred to power supply
