tda7498l STMicroelectronics, tda7498l Datasheet - Page 18

• Manufacturer Part Number: tda7498l
• Description: 80 W + 80 W Dual Btl Class-d Audio Amplifier
• Manufacturer: STMicroelectronics

Applications information
5
5.1
5.2
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Applications information
Applications circuit
Figure 20. Applications circuit
Mode selection
The three operating modes of the TDA7498L are set by the two inputs, STBY (pin 20) and
MUTE (pin 21).
Standby mode: all circuits are turned off, very low current consumption.
Mute mode: inputs are connected to ground and the positive and negative PWM
outputs are at 50% duty cycle.
Play mode: the amplifiers are active.
INPUT
3V3
J1
SGND
SGND
3V3
C29
2.2uF
3
4
1
2
J4
OUT
L-
L+
R-
R+
1
FS
FS
L4931CZ33
3V3 POWER SUPPLY
100nF
IC2
2 GND
SGND
SGND
SGND
SGND
SGND
SGND
SGND
C8
S2
S1
SGND
MUTE
STBY
SGND
J7
SGND
1
3
1
3
SGND
3
100nF
J8
IN
39K
R3
C9
Single-Ended
Single-Ended
1uF
2
2
C11
C12
1uF
For
Input
1uF
3
1uF
Input
SGND
C1
C2
For
SGND
SGND
SGND
SGND
120K
2
FREQUENCY SHIFT
R9
SGND
100nF
18V
D1
1
C5
6.8k
R8
VDDS
100nF
R14
R13
120k
22R
Q1
33k
R7
C6
R4
R2
VCC
68k
47k
SGND
DIAG
FS
+
+
SGND
SGND
SGND
SGND
SGND
SGND
SGND
SGND
SGND
SGND
SGND
100k
VDDS
R1
100nF
1nF
1nF
C13
C14
C15
2.2uF
16V
2.2uF
C3
C4
C10
SYNC
1nF
1nF
16V
C7
J5
J6
35
22
23
27
26
30
32
33
28
25
24
36
21
20
18
31
19
1
Doc ID 16504 Rev 1
SUB_GND
INPA
SGND
VDDPW
PGND
SYNCLK
VSS
INPB
INNB
MUTE
STBY
INNA
VDDS
DIAG
ROSC
GAIN0
GAIN1
SVCC
CLASS-D AMPLIFIER
TDA7498L
TDA7498L
IC1
PGNDA
PGNDA
OUTNA
PGNDB
PVCCA
OUTNA
OUTPB
OUTPB
PVCCB
PGNDB
OUTNB
OUTNB
OUTPA
PVCCA
PVCCB
OUTPA
VREF
SVR
11
100nF
13
10
100nF
16
17
12
14
15
9
7
6
8
3
2
5
4
34
29
C19
C25
SGND
SGND
C17
10uF
10V
10uF
C16
10V
330pF
330pF
22R
1uF
22R
C30
1uF
R5
C31
C21
R6
C27
6 ohm
8 ohm
Load
*
*
*
*
22uH
22uH
L4
L3
22uH
22uH
L1
L2
LC FILTER COMPONENT
L1,L2,L3,L4
22 uH
22 uH
680nF
680nF
C26
C20
*
220nF
220nF
220nF
220nF
C18
C22
C28
C24
2200uF
C23
50V
*
*
*
*
*
680 nF
C20,C26 C18,C22,C24,C28
470 nF
+
1
2
220nF
220nF
J2
220nF
220nF
C40
R18
R15
8R
C41
R17
C42
C43
8R
R16
8R
8R
VCC
GND
220 nF
220 nF
TDA7498L
Load=6 ohm
OUTPUT
L+
L-
R-
R+
J3
1
2
3
4