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Philips Semiconductors
2 40 W/2
stereo BTL car radio
power amplifier with diagnostic facility
V P
handbook, halfpage
10 k
47 F
Fig.7 Mode select switch circuitry.
2
10
THD
(%)
10
1
1
10
2
10
2
10
(1) f = 10 kHz.
(2) f = 1 Hz.
(3) f = 100 Hz.
Fig.8 Total harmonic distortion as a function of output power; V
1996 Jan 08
10 k
mode
select
switch
100 k
MGA708
1
10
11
Diagnostic output
Special care must be taken in the printed-circuit board
layout to separate pin 12 from pin 1 and pin 13, to
minimize the crosstalk between the diagnostic output and
the inputs.
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 pin 1 and pin 13).
The circuit in Fig.7 slowly ramps up the voltage at the
mode select switch pin when switching on and results in
fast muting when switching off.
(1)
(2)
(3)
1
10
= 14.4 V; R
P
Product specification
TDA8560Q
MGA904
2
P (W)
10
o
= 2 .
L
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