TDA8926 Datasheet, PDF (16/32 Pages) NXP Semiconductors – Power stage 2 x 50 W class-D audio amplifier

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VDDA mode select
C1 220 nF
D1
(5.6 V)
R19
39 kΩ
on
mute
off
R20
39 kΩ
S1
GND
VSSA
VDDA
C2 220 nF
VSSA
VDD1 VDD2
VSS2 VSS1
3
MODE ₆
C44
220 nF
R1
27 kΩ
OSC ₇
10 12
U2
1
PWM2
17
SW2
13
REL2
14
EN2
16
C3
220 nF
TDA8929T ₁₉ STAB
GND
SGND1
2
SGND2
11
18 ^VSSD
C4
220 nF
VSSA
C43
IN1+
5
180 pF
22
DIAGCUR
CONTROLLER
C22
330 pF
IN1−
4
IN2 +
8
EN1
21
REL1
23
J5
C23
330 pF
IN2 −
J6
9
SW1
24
PWM1
20
15
R24
200 kΩ
D2
(7.5 V)
VSSD
R10
1 kΩ
SW2
17
11
REL2
16
EN2
VDDD
14
U1
12
POWERUP
TDA8926J ⁵
15
C5 _{STAB 9}
or
TDA8927J
13
220 nF
DIAG
10
3
POWER STAGE ⁸
EN1
4
6
REL1
2
SW1
1
7
VDDD
C10
560 pF
R11
5.6 Ω
OUT2
C8
15 nF
BOOT2
VDD1
VDD2
C7
220 nF
VSS2
VSS1
BOOT1
C9
OUT1 ^{15 nF}
R13
5.6 Ω
VSSD
C11
560 pF
R12
5.6 Ω
L2
Sumida 33 µH
CDRH127- 330
C14
470 nF
VDDD
C6
220 nF
VSSD
C16
470 nF
Sumida 33 µH
CDRH127- 330
L4
R14
5.6 Ω
C25
C24
C26
C27
470 nF 470 nF 470 nF 470 nF
n.c.
C12
560 pF
C13
560 pF
R5
10 kΩ
C28
1 nF
R4
10 kΩ
input 1
J1
QGND
J3
J2
VSS
R6
10 kΩ
C29
1 nF
R7
10 kΩ
input 2
J4
QGND
+25 V
GND
−25 V
QGND
C30
1 nF
VDD
1
2
3
VSS
C31
inputs
1 nF
QGND
L5
bead
R21
10 kΩ
R22
9.1 kΩ
bead
L6
L7
bead
C32
220 nF
C33
220 nF
VDDD
C34
1500 µF
(35 V)
C36
220 nF
C35
1500 µF
(35 V)
VSSD
C38
220 nF
C37
220 nF
C39
220 nF
power supply
VDDD VSSD
VDDA
C40
47 µF
(35 V)
GND
C41
47 µF
(35 V)
VSSA
MLD633
QGND
C18
1 nF
R15
24 Ω
C19
1 nF
OUT2−
1
2
OUT2+
4 or 8 Ω
SE
C15
220 nF
QGND
GND
C17
220 nF
QGND
R16
24 Ω
C20
1 nF
C21
1 nF
OUT2−
2
1
OUT1+
OUT1−
2
1
OUT1+
8Ω
BTL
4 or 8 Ω
SE
QGND
outputs
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).
Inputs floating or inputs referenced to QGND (close J1 and J4) or referenced to V_SS (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.