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V
mode select
220 nF
C1
C2
DDA
V
V
SSD
DDD
V
V
SSA
DDA
220 nF
V
R19
39 kΩ
R20
C10
560 pF
C11
560 pF
V
V
V
DD1 DD2
10
SS2 SS1
1
QGND
C18
39 kΩ
3
12
R11
5.6 Ω
R12
5.6 Ω
on
PWM2
SW2
MODE
17
13
14
16
D1
(5.6 V)
mute
off
6
1 nF
L2
−
OUT2
SW2
REL2
EN2
C44
220 nF
S1
17
16
14
11
12
1
Sumida 33 µH
CDRH127-330
REL2
EN2
OUT2
C8
15 nF
4 or 8 Ω
SE
R1
2
OSC
GND
7
R15
24 Ω
U2
V
U1
+
−
DDD
OUT2
BOOT2
C19
1 nF
27 kΩ
C14
V
SSA
C3
470 nF
R24
200 kΩ
V
DD1
V
5
C15
220 nF
STAB
DDD
TDA8929T
TDA8926J
or
TDA8927J
QGND
19
POWERUP
220 nF
V
DD2
15
9
OUT2
2
13
C4
220 nF
SGND1
SGND2
D2
(7.5 V)
2
C5
C7
220 nF
V
SS2
C6
220 nF
V
8 Ω
BTL
STAB
SSD
GND
GND
18
22
V
V
SSA
SSD
R10
1
11
C43
180 pF
220 nF
DIAG
10
8
+
OUT1
3
C17
220 nF
V
QGND
+
SS1
IN1
DIAGCUR
1 kΩ
V
5
CONTROLLER
POWER STAGE
SSD
C16
C22
C20
1 nF
470 nF
330 pF
R16
24 Ω
−
+
IN1
BOOT1
OUT1
−
OUT1
2
EN1
EN1
REL1
SW1
4
8
6
7
21
23
24
20
4
2
1
C9
15 nF
REL1
SW1
Sumida 33 µH
CDRH127-330
IN2
4 or 8 Ω
SE
1
C23
J5
J6
330 pF
L4
+
OUT1
−
IN2
PWM1
C21
1 nF
9
R13
R14
5.6 Ω
5.6 Ω
15
QGND
outputs
C25
470 nF
C24
470 nF
C26
470 nF
C27
470 nF
C12
560 pF
C13
560 pF
n.c.
V
V
SSD
DDD
R5
10 kΩ
R4
10 kΩ
R6
10 kΩ
R7
10 kΩ
L7
bead
QGND
V
C28
C29
L5
bead
DDA
C30
1 nF
V
C40
47 µF
(35 V)
1 nF
1 nF
DDD
C36
220 nF
C37
220 nF
C34
1500 µF
(35 V)
V
V
+
25 V
DD
C32
220 nF
R21
10 kΩ
1
2
3
GND
GND
input 1
input 2
C35
1500 µF
(35 V)
J1
J3
J2
J4
R22
9.1 kΩ
C33
220 nF
C41
47 µF
(35 V)
C38
220 nF
C39
220 nF
−
25 V
SS
QGND
QGND
V
SSD
bead
L6
C31
1 nF
V
inputs
SSA
V
SS
MLD633
power supply
QGND
R21 and R22 are necessary only in BTL applications with asymmetrical supply.
BTL: remove R6, R7, C23, C26 and C27 and close J5 and J6.
C22 and C23 influence the low-pass frequency response and should be tuned with the real load (loudspeaker).
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Inputs floating or inputs referenced to QGND (close J1 and J4) or referenced to VSS (close J2 and J3) for an input signal ground reference.
Fig.7 Two-chip class-D audio amplifier application diagram for TDA8926J and controller TDA8929T.
NXP [ NXP ]
