Philips Semiconductors
Product specification
2 × 40 W/2 Ω stereo BTL car radio power
amplifier with diagnostic facility
TDA8563AQ
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).
+V
P
handbook, halfpage
10 kΩ
MODE
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.
47 µF
BZX79C/3.9V
MGD959
Fig.7 Mode select switch circuitry.
MLB667
2
10
handbook, full pagewidth
THD
(%)
10
1
(1)
1
10
(2)
(3)
2
10
2
1
2
10
10
1
10
P
(W)
10
o
(1) f = 10 kHz.
(2) f = 1 Hz.
(3) f = 100 Hz.
Fig.8 Total harmonic distortion as a function of output power; VP = 14.4 V; RL = 2 Ω.
1997 Feb 20
11
NXP [ NXP ]
