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Philips Semiconductors
2 × 24 W BTL or 4 × 12 W single-ended
car radio power amplifier
Mode select switch
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during >100 ms (charging of the input
capacitors at pins 1, 3, 15 and 17.
The circuit in Fig.11 slowly ramps up the voltage at the
mode select switch pin when switching on and results in
fast muting when switching off.
2
10
THD
(%)
10
1
1
10
2
10
2
10
(1) f = 10 kHz.
(2) f = 1 kHz.
(3) f = 100 Hz.
Fig.12 Total harmonic distortion as a function of output power; V
1999 Jun 30
1
10
V P
handbook, halfpage
10 kΩ
47 µF
Fig.11 Mode select switch circuitry.
(1)
(2)
(3)
1
14
Product specification
TDA8561Q
100 Ω
mode
select
switch
100 kΩ
MGA708
MGA709
10
P (W)
o
= 4 Ω.
= 14.4 V, R
P
L
2
10
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