Test And Application Information; Application Information; Diagnostic Output; Mode Select Switch - Philips TDA8566TH Datasheet

Philips Semiconductors
2 × 40 W/2 Ω stereo BTL car radio power amplifier
with differential inputs and diagnostic outputs

TEST AND APPLICATION INFORMATION

handbook, full pagewidth
R s /2
V in1
R s /2
R s /2
V in2
R s /2

Application information

D
IAGNOSTIC OUTPUT
Special care must be taken in the PCB layout to separate
pin CLIP from pins IN1+, IN1−, IN2+ and IN2− to minimize
the crosstalk between the CLIP output and the inputs.
M
ODE SELECT SWITCH
To avoid switch-on plops, it is advisable to keep the
amplifier in the mute mode during ≥150 ms (charging of
the input capacitors at pins IN1+, IN1−, IN2+ and IN2−).
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.
2001 Apr 24
+
V mode
_
20
+
8
220 nF
60
kΩ
60
kΩ
220 nF
_
9
V ref
+
−
10
+
2
220 nF
60
kΩ
60
kΩ
220 nF
_
3
Fig.6 Stereo BTL test diagram.
100
12 19
+
+
13
−
TDA8566TH
−
_
15
+
CLIP 11
DETECTOR
DIAGNOSTIC 1
INTERFACE
+
+
16
−
−
_
18
+
14 17
+V supply
handbook, halfpage
Fig.7 Mode select switch circuit.
10
Objective specification
TDA8566TH
+
V P =
2200
_
µF/16V 14.4 V
nF
R L1
V P V P
10 10
kΩ kΩ
CLIP
DIAG
R L2
MGU359
S
100 Ω
10 kΩ
47 µF
100 kΩ
mode
select
switch
MGD102