INTEGRATED CIRCUITS
DATA SHEET
TDA8561Q
2
×
24 W BTL or 4
×
12 W
single-ended car radio power
amplifier
Product specification
Supersedes data of 1997 Sep 22
File under Integrated Circuits, IC01
1999 Jun 30
Philips Semiconductors
Product specification
2
×
24 W BTL or 4
×
12 W single-ended
car radio power amplifier
FEATURES
•
Requires very few external components
•
High output power
•
Flexibility in use; Quad single-ended or stereo BTL
•
Low output offset voltage
•
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
QUICK REFERENCE DATA
SYMBOL
V
P
I
ORM
I
P
I
sb
P
o
RR
V
no
Z
I
∆V
O
|
P
o
PARAMETER
positive operating supply voltage
repetitive peak output current
total quiescent current
standby current
R
L
= 4
Ω;
THD = 10%
R
s
= 0
Ω
CONDITIONS
6
−
−
−
−
46
−
25
−
MIN.
−
80
0.1
TYP.
14.4
•
Reverse polarity safe
•
Electrostatic discharge protection
•
No switch-on/switch-off plop
•
Flexible leads
•
Low thermal resistance
TDA8561Q
•
Identical inputs (inverting and non-inverting).
GENERAL DESCRIPTION
The TDA8561Q is an integrated class-B output amplifier in
a 17-lead single-in-line (SIL) power package. It contains
4
×
12 W Single-Ended (SE) or 2
×
24 W Bridge-Tied
Load (BTL) amplifiers.
The device is primarily developed for car radio
applications.
MAX.
18
4
−
100
−
−
−
−
150
V
A
UNIT
mA
µA
Stereo BTL application
output power
supply voltage ripple rejection
noise output voltage
input impedance
DC output offset voltage
24
−
70
−
−
W
dB
µV
kΩ
mV
Quad single-ended application
output power
THD = 10%
R
L
= 4
Ω
R
L
= 2
Ω
RR
V
no
Z
I
supply voltage ripple rejection
noise output voltage
input impedance
R
s
= 0
Ω
−
−
46
−
50
7
12
−
50
−
−
−
−
−
−
W
W
dB
µV
kΩ
ORDERING INFORMATION
TYPE
NUMBER
TDA8561Q
PACKAGE
NAME
DESCRIPTION
VERSION
SOT243-1
DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm)
1999 Jun 30
2
Philips Semiconductors
Product specification
2
×
24 W BTL or 4
×
12 W single-ended
car radio power amplifier
BLOCK DIAGRAM
TDA8561Q
V P1
5
non-inverting
input 1
1
60
kΩ
VA
2
kΩ
18 kΩ
mute switch
60
kΩ
3
VA
2
kΩ
18 kΩ
VP
power stage
power stage
mute switch
Cm
VP2
13
TDA8561Q
6
output 1
Cm
inverting
input 2
8
output 2
14
stand-by
switch
VA
15 kΩ
x1
supply voltage
ripple rejection
4
15 kΩ
mute
reference
voltage
Cm
mute switch
60
kΩ
VA
2
kΩ
18 kΩ
mute switch
60
kΩ
VA
2
kΩ
18 kΩ
power stage
10
power stage
12
PROTECTIONS
thermal
short-circuit
stand-by
reference
voltage
mute
switch
16
mode
select
switch
diagnostic
output
non-inverting
input 4
17
output 4
Cm
inverting
input 3
15
output 3
2
input
reference
voltage
9
7
GND1
11
GND2
power ground (substrate)
MEA858 - 1
ground
(signal)
not connected
Fig.1 Block diagram.
1999 Jun 30
3
Philips Semiconductors
Product specification
2
×
24 W BTL or 4
×
12 W single-ended
car radio power amplifier
PINNING
SYMBOL
−INV
1
GND(S)
INV 2
RR
V
P1
OUT 1
GND1
OUT 2
n.c.
OUT 3
GND2
OUT 4
V
P2
MODE
INV 3
V
DIAG
−INV
4
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DESCRIPTION
non-inverting input 1
signal ground
inverting input 2
supply voltage ripple rejection
supply voltage
output 1
power ground 1
output 2
not connected
output 3
power ground 2
output 4
supply voltage
mode select switch input
inverting input 3
diagnostic output
non-inverting input 4
V P1
OUT 1
GND1
OUT 2
n.c.
5
6
7
8
9
TDA8561Q
INV 1
GND(S)
INV 2
RR
1
2
3
4
TDA8561Q
OUT 3 10
GND2 11
OUT 4 12
V P2 13
MODE 14
INV 3 15
V DIAG 16
INV 4 17
MEA859 - 1
Fig.2 Pin configuration.
1999 Jun 30
4
Philips Semiconductors
Product specification
2
×
24 W BTL or 4
×
12 W single-ended
car radio power amplifier
FUNCTIONAL DESCRIPTION
The TDA8561Q contains four identical amplifiers and can
be used for Single-Ended (SE) or Bridge-Tied Load (BTL)
applications. The gain of each amplifier is fixed at 20 dB
(26 dB in BTL). Special features of the device are:
Mode select switch (pin 14)
•
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.11).
Diagnostic output (pin 16)
D
YNAMIC
D
ISTORTION
D
ETECTOR
(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 Figs 3 and 4).
S
HORT
-
CIRCUIT PROTECTION
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 both
channels occurs the output stages are switched off for
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).
Fig.3
handbook, halfpage
VO
TDA8561Q
During this short-circuit condition, pin 16 is LOW for 20 ms
and HIGH for 50
µs
(see Fig.5).
The power dissipation in any short-circuit condition is very
low.
MGA705
0
V16
VP
0
t
Distortion detector waveform; BTL
application.
handbook, halfpage
VO
MGA706
0
V16
VP
0
t
Fig.4
Distortion detector waveform; single-ended
application.
1999 Jun 30
5
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