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C3
R2
V
V
V
P
P
6.8 kΩ
2.2 nF
R1
R3
PA
10 Ω
3.9 kΩ
C1
C2
R4
470 µF
(35 V)
100 nF
V
V
P
PA
1 kΩ
(1)
R11
C17
C5
C4
GND
470 kΩ
15 nF
2.2 nF
C7
100 nF
V
C6
47 µF
(25 V)
P
C8
220 pF
2.2 nF
R5
5
18
BOOT
INN
17
3
4
6
C9
2.2 µF
47 kΩ
C10
220 pF
C11
R6
INP
C12
15 nF
+
IN
−
2.2 kΩ
R8
2.2 kΩ
R7
220 nF
10 Ω
POWERUP
V
L1
PA
OUT
+
OUT
−
R9 47 kΩ
R13 15 kΩ
16
U1
TDA8931
22 µH
R12
C13
100 nF
C14
680 nF
EN
DIAG
OVP
7
HVP
13
19
47 kΩ
8
HVPI
(3)
C15
1000 µF
R10
22 Ω
(2)
12
9
S1
(35 V)
STABI
CGND
14
2
15
1 10 11 20
C16
220 nF
001aab812
(1) Optional feed forward network to improve SVRR.
(2) Standby mode: S1 = closed; Operating mode: S1 = open.
(3) The low frequency gain is determined by the capacitor in series with the speaker. The cut-off frequency with a 4 Ω speaker and C15 = 1000 µF is 40 Hz.
Fig 5. Typical application diagram with TDA8931 supplied from an asymmetrical supply
NXP [ NXP ]
