TDA7498L Datasheet, PDF (18/27 Pages) STMicroelectronics – 80 watt + 80 watt dual BTL class-D audio amplifier

Applications information
5
Applications information
TDA7498L
5.1
Applications circuit
Figure 20. Applications circuit
J1
INPUT
3 L-
4 L+
1 R-
2 R+
1 _{SUB_GND}
C1
22 INPA
1uF
C2
C3
1nF
SGND
23 INNA
1uF
C4
1nF
SGND
27 SGND
C5
100nF
SGND
VDDS26 _VDDS
R1 28 _DIAG
For
R7
J7 Single-Ended 22R
Input
SGND
C6
100nF
100k
DIAG
19 VDDPW
18 PGND
OUTPA ¹⁶
OUTPA ¹⁷
PGNDA ¹⁴
R6
PGNDA ¹⁵
22R
C25
100nF
PVCCA 12
PVCCA ¹³
OUTNA ¹⁰
OUTNA ¹¹
C30
1uF
C27
330pF
C8
100nF
SGND
3
FREQUENCY
Q1
SHIFT
25
SYNC
R3
39K
1
2
R13 68k
R9
FS
24
120K ^{R14 47k}
SGND
J5 30
SGND
SYNCLK
ROSC
GAIN0
VDDS
31 GAIN1
IC1
TDA7498L
OUTPB ³
OUTPB 2
PVCCB ⁷
R5
22R
PVCCB ⁶
For
J8 _Single-Ended
Input
SGND
J6
35 SVCC
C10
100nF 36 _VSS
C19
100nF
PGNDB ⁵
PGNDB ⁴
C31
1uF
C11
3V3
F^FS^S
1uF
3V3
J4
C12
S2 _MUTE 1uF
1
2
3
S1 STBY
SGND
1
2
3
SGND
SGND
SGND
R4
SGND
120k ⁺
R2
SGND
33k ⁺
OUT IC2 IN
R8 _VCC ^SGND
C29 ^{1 L4931CZ33 3}
2.2uF
2 GND ^C9
100nF
6.8k
D1
18V
32
C13
1nF 33
C14
1nF 21
C15
2.2uF
16V
20
C7
2.2uF
16V
INPB
INNB
MUTE
STBY
SGND
SGND
SGND
SGND
SGND
3V3 POWER SUPPLY
OUTNB 9
OUTNB ⁸
C21
330pF
VREF 34 _C17
10uF
SVR
29 10V SGND
C16
TDA7498L
10uF
SGND
10V
CLASS-D AMPLIFIER
L4
*^22uH
*
C28
220nF
* ^C26
* ^680nF
C24
220nF
L3
* ^22uH
L1
* ^22uH
2200uF
C23+
50V
* C18
220nF
* ^C20
680nF
* ^C22
220nF
L2
* ^22uH
R15
8R
C40
220nF
C41
220nF
R16
8R
J3
OUTPUT
Load=6 ohm
L+
L- ¹
R- ²
R+³
4
1 _VCC
2 _GND
J2
R17
8R
C42
220nF
C43
220nF
R18
8R
LC FILTER COMPONENT
Load L1,L2,L3,L4 C20,C26 C18,C22,C24,C28
6 ohm 22 uH
680 nF
220 nF
8 ohm 22 uH
470 nF
220 nF
5.2
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.
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Doc ID 16504 Rev 3