Philips TDA8565Q Datasheet
INTEGRATED CIRCUITS
DATA SH EET
TDA8565Q
4 × 12 W single-ended car radio
power amplifier with diagnostic
interface
Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC01
1995 Dec 08
Philips Semiconductors Product specification
4 × 12 W single-ended car radio
power amplifier with diagnostic interface
FEATURES
• Requires very few external components
• High output power
• Fixed gain
• Diagnostic facility (distortion, short-circuit and
temperature detection)
• Good ripple rejection
• Mode select switch (operating, mute and standby)
• Load dump protection
• AC and DC short-circuit safe to ground and to V
P
• Low power dissipation in any short-circuit condition
• Thermally protected
• Reverse polarity safe
• Electrostatic discharge protection
• No switch-on/switch-off plop
• Flexible leads
• Low thermal resistance
• Identical inputs.
GENERAL DESCRIPTION
The TDA8565Q is an integrated class-B output amplifier in
a 17-lead DIL-bent-to-SIL power package. It contains
4 × 12 W single-ended amplifiers.
APPLICATIONS
• The device is primarily developed for car radio
TDA8565Q
applications.
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
I
ORM
I
q(tot)
I
sb
Z
input impedance 50 −−kΩ
I
P
o
operating supply voltage 6.0 14.4 18.0 V
repetitive peak output current −−4A
total quiescent current − 88 − mA
standby current − 0.1 100 µA
output power RL=4Ω; THD = 10% − 6.4 − W
R
=2Ω; THD = 10% − 12 − W
L
SVRR supply voltage ripple rejection − 41 − dB
V
no
noise output voltage Rs=0Ω−200 −µV
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8565Q DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1
1995 Dec 08 2
Philips Semiconductors Product specification
4 × 12 W single-ended car radio
power amplifier with diagnostic interface
BLOCK DIAGRAM
handbook, full pagewidth
input 1
input 2
supply voltage
ripple rejection
input 4
1
60
kΩ
180
Ω
180
Ω
3
180
Ω
x1
4
17
60
kΩ
180
Ω
18 kΩ
18 kΩ
stand-by
switch
VA
15 kΩ
15 kΩ
18 kΩ
mute switch
VA
mute switch
VA
V
P
mute switch
VA
PROTECTIONS
mute
reference
voltage
C
m
C
m
thermal
short-circuit
C
m
power stage
power stage
stand-by
reference
voltage
mute
switch
power stage
V
P1
5
13
TDA8565Q
TDA8565Q
V
P2
6
output 1
8
output 2
mode
14
select
switch
16
diagnostic
output
12
output 4
mute switch
60
kΩ
input 3
15
180
Ω
input
reference
voltage
2711
ground
(signal)
VA
18 kΩ
9
not connected
Fig.1 Block diagram.
1995 Dec 08 3
C
m
GND1 GND2
power ground (substrate)
power stage
10
MLC392
output 3
Philips Semiconductors Product specification
d
4 × 12 W single-ended car radio
TDA8565Q
power amplifier with diagnostic interface
PINNING
SYMBOL PIN DESCRIPTION
IN1 1 input 1
SGND 2 signal ground
IN2 3 input 2
SVRR 4 supply voltage ripple rejection
V
P1
5 supply voltage 1
OUT1 6 output 1
GND1 7 power ground 1
OUT2 8 output 2
n.c. 9 not connected
OUT3 10 output 3
GND2 11 power ground 2
OUT4 12 output 4
V
P2
13 supply voltage 2
MODE 14 mode select switch input
IN3 15 input 3
V
DIAG
16 diagnostic output
IN4 17 input 4
FUNCTIONAL DESCRIPTION
The TDA8565Q contains four identical amplifiers which
can be used for single-ended applications. The gain of
each amplifier is fixed at 40 dB. Special features of the
device are as follows.
Mode select switch (pin 14)
book, halfpage
IN1
1
SGND
2
IN2
3
SVRR
4
V
5
P1
OUT1
6
GND1
7
OUTP2
OUTP4
V
n.c.
OUT3
GND2
V
P2
MODE
IN3
DIAG
IN4
8
9
10
11
12
13
14
15
16
17
TDA8565Q
MLC393
Fig.2 Pin configuration.
• Low standby current (<100 µA)
• Low switching current (low cost supply switch)
• Mute facility.
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).
This can be achieved by:
• Microcontroller control
• External timing circuit (see Fig.3).
The circuit in Fig.3 slowly ramps up the voltage at the
mode select switch pin when switching on and results in
fast muting when switching off.
In the event of fast switching at mode select pin it is
advised to increase the
1
⁄2VP decoupling capacitor (pin 4)
to 150 µF to avoid switch plops.
1995 Dec 08 4
handbook, halfpage
Fig.3 Mode select switch circuitry.
V
P
10 kΩ 100 Ω
47 µF
mode
select
switch
100 kΩ
MGA708
Philips Semiconductors Product specification
4 × 12 W single-ended car radio
power amplifier with diagnostic interface
Diagnostic output (pin 16)
D
YNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin 16
goes LOW. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and thus limit the distortion. The output level of
pin 16 is independent of the number of channels that are
clipping (see Fig.4).
HORT-CIRCUIT PROTECTION
S
When a short-circuit occurs at one or more outputs to
ground or to the supply voltage, the output stages are
switched off until the short-circuit is removed and the
device is switched on again, with a delay of approximately
20 ms after removal of the short-circuit. During this
short-circuit condition, pin 16 is continuously LOW.
When a short-circuit across the load of one or more
channels occurs the output stages are switched off during
approximately 20 ms. After that time it is checked during
approximately 50 µs to see whether the short-circuit is still
present. Due to this duty cycle of 50 µs/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA).
During this short-circuit condition, pin 16 is LOW for 20 ms
and HIGH for 50 µs (see Fig.5).
TDA8565Q
andbook, halfpage
V
O
0
V
16
V
P
0
Fig.4 Distortion detector waveform.
T
EMPERATURE DETECTION
When the virtual junction temperature Tvj reaches 150 °C,
pin 16 will be active LOW.
O
PEN COLLECTOR OUTPUT
MGA706
t
The power dissipation in any short-circuit condition is
very low.
handbook, full pagewidth
current
in
output
stage
V
15
short-circuit over the load
V
P
Fig.5 Short-circuit waveform.
Pin 16 is an open-collector output, which allows pin 16 of
more devices being tied together.
MGA707
t
20 ms
t
50 µs
1995 Dec 08 5
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