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2002 Mar 05 10
Philips Semiconductors Product specification
4 × 40 W BTL quad car radio power
amplifier
TDA8571J
TEST AND APPLICATION INFORMATION
Fig.7 Application circuit diagram.
Specialcaremustbe takeninthe PCB-layoutto separatepin V
DIAG
fromthepins IN1, IN2,IN3and IN4 tominimizethe crosstalkbetweentheclip output
and the inputs.
To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during a period of ≥ 150 ms (charging the input capacitors at pins IN1,
IN2, IN3 and IN4).
handbook, full pagewidth
MGM564
OUT1+
R
L
= 4 Ω
OUT1−
+
−
+
−
V
ref
2
IN1
input 1
IN2
input 2
4
15
10
MODE
2200 µF100 nF
23
+14.4 V
1681
V
P1
V
P2
V
P3
V
P4
V
P
30 kΩ
OUT2+
R
L
= 4 Ω
OUT2−
+
−
+
−
7
5
11
30 kΩ
211863
PGND1 PGND2 PGND3 PGND4
power ground (substrate)
OUT3+
R
L
= 4 Ω
OUT3−
+
−
+
−
V
ref
17
IN3
SGND
TDA8571J
input 3
IN4
input 4
19
13
12
30 kΩ
OUT4+
R
L
= 4 Ω
OUT4−
+
−
+
−
22
20
14
30 kΩ
10 kΩ
V
DIAG
+V
P
DIAGNOSTIC
diagnostic
output
9
470 nF
470 nF
470 nF
470 nF