TDA7498 Datasheet, PDF (11/28 Pages) STMicroelectronics – 100-watt + 100-watt dual BTL class-D audio amplifier

3
3.1
Characterizations
Test circuit
Figure 3 shows the test circuit with which the characterization curves, shown in the next sections, were measured. Figure 4 shows
the PCB layout.
Figure 3.
Test circuit for characterizations
J1
INPUT
3 L-
4 L+
1 R-
2 R+
C1
1uF
C2
1uF
C5
100nF
For
R7
J7 _{Single-Ended 22R}
Input
C6
100nF
1 _{SUB_GND}
22 INPA
C3
1nF 23 INNA
C4
1nF 27 SGND
VDDS 26 VDDS
R1
28 DIAG
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
FREQUENCY SHIFT
Q1 R9
KTC3875(S) _180K
R13
3
C8
FS
47k
1
2
R14
100nF
100k
25 SYNCLK
R3
39K
24 ROSC
J5 30 GAIN0
VDDS
31 GAIN1
IC1
TDA7498
OUTPB ³
OUTPB 2
PVCCB ⁷
R5
22R
PVCCB ⁶
For
J8
Single-Ended
Input
J6
35 SVCC
C10
100nF 36 _VSS
C19
100nF
PGNDB ⁵
PGNDB ⁴
C31
1uF
C11
3V3
FS
3V3
J4
1uF
C12
S2 _MUTE 1uF
1
2
3
S1 _STBY
1
2
3
R4
120k ⁺
R2
33k ⁺
OUT
IC2 IN
1 ^L4931CZ33 3
C29
2.2uF
2 GND ^C9
100nF
R8 _VCC
6.8k
D1
18V
32 _INPB
C13
1nF _{33 INNB}
C14
1nF _{21 MUTE}
C15
2.2uF
16V
20
STBY
C7
2.2uF
16V
3V3 POWER SUPPLY
OUTNB 9
OUTNB ⁸
C21
330pF
VREF 34
C17
SVR 29
10uF
10V
C16
10uF
TDA7498
10V
CLASS-D AMPLIFIER
L4
*^22uH
*
C28
220nF
* ^C26
* ^680nF
C24
220nF
L3
* ^22uH
L1
* ^22uH
2200uF
C23+
50V
* C18
220nF
L2
* ^22uH
* ^C20
680nF
* ^C22
220nF
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 COMPONENTS
Load
6 ohm
L1,L2,L3,L4
22 uH
C20,C26 C18,C22,C24,C28
680 nF
220 nF
8 ohm
22 uH
470 nF
220 nF