DATA SHEET
Preliminary specification
File under Integrated Circuits, IC01
1998 Mar 13
INTEGRATED CIRCUITS
TDA8571J
4 x 40 W BTL quad car radio power
amplifier
1998 Mar 13
2
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
FEATURES
•
Requires very few external components
•
High output power
•
Low output offset voltage
•
Fixed gain
•
Diagnostic facility (distortion, short-circuit and
temperature pre-warning)
•
Good ripple rejection
•
Mode select switch (operating, mute and standby)
•
Load dump protection
•
Short-circuit safe to ground and to V
P
and across the
load
•
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
•
Pin compatible with the TDA8568Q, except for the gain.
GENERAL DESCRIPTION
The TDA8571J is a integrated class-B output amplifier
contained in a 23-lead Single-In-Line (SIL) plastic power
package. It contains four amplifiers in a BTL configuration,
each with a gain of 34 dB. The output power is 4
×
40 W
(EIAJ) into a 4
Ω
load.
APPLICATIONS
•
The device is primarily developed for car radio
applications.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
operating supply voltage
6
14.4
18
V
I
ORM
repetitive peak output current
−
−
7.5
A
I
q(tot)
total quiescent current
−
200
−
mA
I
stb
standby current
−
0.2
100
µ
A
I
sw
switch-on current
−
−
80
µ
A
Z
i
input impedance
25
30
−
k
Ω
P
o(max)
maximum output power
THD = maximum
−
40
−
W
SVRR
supply voltage ripple rejection
R
s
= 0
Ω
−
50
−
dB
α
cs
channel separation
R
s
= 10 k
Ω
−
50
−
dB
G
v(cl)
closed-loop voltage gain
33
34
35
dB
V
n(o)
noise output voltage
R
s
= 0
Ω
−
−
170
µ
V
V
OS
DC output offset voltage
MUTE
−
−
80
mV
∆
V
OS
delta DC output offset voltage
ON
↔
MUTE
−
−
80
mV
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8571J
DBS23P
plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm)
SOT411-1
1998 Mar 13
3
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MGM562
OUT1
+
OUT1
−
+
−
+
−
Vref
2
IN1
IN2
4
23
16
8
1
15
10
MODE
VP1
VP2
VP3
VP4
21
18
6
3
PGND1
PGND2
PGND3
PGND4
30 k
Ω
OUT2
+
OUT2
−
+
−
+
−
7
5
11
30 k
Ω
OUT3
+
OUT3
−
+
−
+
−
Vref
17
IN3
SGND
TDA8571J
IN4
19
13
12
30 k
Ω
OUT4
+
OUT4
−
+
−
+
−
22
20
14
30 k
Ω
VDIAG
DIAGNOSTIC
9
1998 Mar 13
4
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
PINNING
SYMBOL
PIN
DESCRIPTION
V
P1
1
supply voltage 1
OUT1+
2
output 1+
PGND1
3
power ground 1
OUT1
−
4
output 1
−
OUT2
−
5
output 2
−
PGND2
6
power ground 2
OUT2+
7
output 2+
V
P2
8
supply voltage 2
V
DIAG
9
diagnostic output
IN1
10
input 1
IN2
11
input 2
SGND
12
signal ground
IN3
13
input 3
IN4
14
input 4
MODE
15
mode select switch input
V
P3
16
supply voltage 3
OUT3+
17
output 3+
PGND3
18
power ground 3
OUT3
−
19
output 3
−
OUT4
−
20
output 4
−
PGND4
21
power ground 4
OUT4+
22
output 4+
V
P4
23
supply voltage 4
Fig.2 Pin configuration.
handbook, halfpage
TDA8571J
MGM563
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
VP1
OUT1
+
PGND1
OUT1
−
OUT2
−
PGND2
OUT2
+
VP2
VDIAG
IN1
IN2
SGND
IN3
IN4
MODE
VP3
OUT3
+
PGND3
OUT3
−
OUT4
−
PGND4
OUT4
+
VP4
1998 Mar 13
5
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
FUNCTIONAL DESCRIPTION
The TDA8571J contains four identical amplifiers which can
be used for bridge applications. The gain of each amplifier
is fixed at 34 dB.
Mode select switch (pin 15)
•
Standby: low supply current (<100
µ
A)
•
Mute: input signal suppressed
•
Operating: normal on condition.
Since this pin has a low input current (<80
µ
A), a low cost
supply switch can be applied.
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during
≥
150 ms (charging of the input
capacitors at pins 10, 11, 13 and 14). When switching
from standby to mute, the slope should be at least 18 V/s.
This can be realized by:
•
Microprocessor control
•
External timing circuit (see Fig.3).
Diagnostic output (pin 9)
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 9
goes LOW. This information can be used to drive a sound
processor or DC volume control to attenuate the input
signal and so limit the distortion. The output level of pin 9
is independent of the number of channels that are clipping
(see Fig.4).
S
HORT
-
CIRCUIT DIAGNOSTIC
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
10 ms after removal of the short-circuit. During this
short-circuit condition, pin 9 is continuously LOW.
When a short-circuit occurs across the load of one or more
channels, the output stages are switched off during
approximately 10 ms. After that time it is checked during
approximately 50
µ
s to determine whether the short-circuit
is still present.
Due to this duty cycle of 50
µ
s/10 ms the average current
consumption during this short-circuit condition is very low.
During this short-circuit condition, pin 9 is LOW for 10 ms
and HIGH for 50
µ
s (see Fig.5). The protection circuits of
all channels are coupled. This means that if a short-circuit
condition occurs in one of the channels, all channels are
switched off. Consequently, the power dissipation in any
short-circuit condition is very low.
T
EMPERATURE PRE
-
WARNING
When the virtual junction temperature T
vj
reaches 145
°
C,
pin 9 goes LOW.
O
PEN COLLECTOR OUTPUTS
The diagnostic pin has an open collector output, so more
devices can be tied together. An external pull-up resistor is
needed.
Fig.3 Mode select switch circuitry.
handbook, halfpage
+
VP
MODE
MGD959
BZX79C/3.9V
10 k
Ω
47
µ
F
Fig.4 Distortion detector waveform.
handbook, halfpage
V9
0
VP
Vo
0
t
MGG155
1998 Mar 13
6
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
Fig.5 Short-circuit waveform.
handbook, full pagewidth
MGG156
short-circuit over the load
10 ms
50
µ
s
t
t
VP
short
circuit
current
V9
1998 Mar 13
7
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
supply voltage
operating
−
18
V
non-operating
−
30
V
load dump protection;
during 50 ms; t
r
≥
2.5 ms
−
45
V
V
sc(safe)
short-circuit safe voltage
−
18
V
V
rp
reverse polarity voltage
−
6
V
I
OSM
non-repetitive peak output current
−
10
A
I
ORM
repetitive peak output current
−
7.5
A
P
tot
total power dissipation
−
60
W
T
stg
storage temperature
−
55
+150
°
C
T
amb
operating ambient temperature
−
40
+85
°
C
T
vj
virtual junction temperature
−
150
°
C
SYMBOL
PARAMETER
VALUE
UNIT
R
th j-a
thermal resistance from junction to ambient in free air
40
K/W
R
th j-c
thermal resistance from junction to case (see Fig.6)
1
K/W
handbook, halfpage
3.2 K/W
0.2 K/W
3.2 K/W
3.2 K/W
3.2 K/W
virtual junction
OUT1
OUT2
OUT3
OUT4
case
MGG157
Fig.6 Equivalent thermal resistance network.
1998 Mar 13
8
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
QUALITY SPECIFICATION
In accordance with
“SNW-FQ-0611E”. The number of the quality specification can be found in the “Quality Reference
Handbook”. The handbook can be ordered using the code 9397 750 00192.
DC CHARACTERISTICS
V
P
= 14.4 V; T
amb
= 25
°
C; measured in Fig.7; unless otherwise specified.
Notes
1. The circuit is DC adjusted at V
P
= 6 to 18 V and AC operating at V
P
= 8.5 to 18 V.
2. At 18 V < V
P
< 30 V the DC output voltage
≤
1
⁄
2
V
P
.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
P
supply voltage
note 1
6
14.4
18
V
I
q(tot)
quiescent current
R
L
=
∞
−
200
360
mA
Operating condition
V
15
mode select switch level
8.5
−
V
p
V
I
15
mode select switch current
V
15
= 14.4 V
−
30
80
µ
A
V
O
output voltage
note 2
−
7.0
−
V
Mute condition
V
15
mode select switch level
3.3
−
6.4
V
V
O
output voltage
note 2
−
7.0
−
V
V
OS
DC output offset voltage
MUTE
−
−
80
mV
∆
V
OS
delta DC output offset voltage
ON
↔
MUTE
−
−
80
mV
Standby condition
V
15
mode select switch level
0
−
2
V
I
stb
standby current
−
0.2
100
µ
A
Diagnostic
V
9
diagnostic output voltage
during any fault condition
−
−
0.6
V
T
vj
temperature pre-warning
V
9
= 0.6 V
−
145
−
°
C
1998 Mar 13
9
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
AC CHARACTERISTICS
V
P
= 14.4 V; R
L
= 4
Ω
; f = 1 kHz; T
amb
= 25
°
C; measured in Fig.7; unless otherwise specified.
Notes
1. Dynamic Distortion Detector (DDD) active, pin 9 is set to logic 0.
2. Frequency response externally fixed.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
P
o
output power
THD = 0.5%
16
19
−
W
THD = 10%
21
26
−
W
V
P
= 13.7 V; THD = 0.5%
−
17.5
−
W
V
P
= 13.7 V; THD = 10%
−
23
−
W
P
o(max)
maximum output power
THD = maximum; V
i
= 2 V (p-p)
square wave
34
40
−
W
THD
total harmonic distortion
P
o
= 1 W
−
0.1
−
%
V
9
=
0.6 V; note 1
−
10
−
%
B
p
power bandwidth
THD = 0.5%; P
o
=
−
1 dB
with respect to 16 W
−
20 to
20000
−
Hz
f
ro(l)
low frequency roll-off
at
−
1 dB; note 2
−
25
−
Hz
f
ro(h)
high frequency roll-off
at
−
1 dB
20
−
−
kHz
G
v(cl)
closed-loop voltage gain
33
34
35
dB
SVRR
supply voltage ripple rejection on; R
s
= 0
Ω
;
V
ripple
= V
ripple(max)
= 2 V (p-p)
40
−
−
dB
mute; R
s
= 0
Ω
;
V
ripple
= V
ripple(max)
= 2 V (p-p)
50
−
−
dB
standby; R
s
= 0
Ω
;
V
ripple
= V
ripple(max)
= 2 V (p-p)
80
−
−
dB
Z
i
input impedance
25
30
38
k
Ω
V
n(o)
noise output voltage
on; R
s
= 0
Ω
;
B = 20 Hz to 20 kHz
−
125
170
µ
V
on; R
s
= 10 k
Ω
;
B = 20 Hz to 20 kHz
−
150
−
µ
V
mute; B = 20 Hz to 20 kHz;
independent of R
s
−
100
−
µ
V
α
cs
channel separation
P
o
= 16 W; R
s
= 10 k
Ω
45
−
−
dB
∆
G
v
channel unbalance
−
−
1
dB
V
o
output signal in mute
V
i
= V
i(max)
= 1 V (RMS)
−
−
2
mV
1998 Mar 13
10
Philips Semiconductors
Preliminary specification
4 x 40 W BTL quad car radio power
amplifier
TDA8571J
TEST AND APPLICATION INFORMATION
Fig.7 Application circuit diagram.
Special care must be taken in the PCB-layout to separate pin 9 from the pins 10, 11 13 and 14 to minimize the crosstalk between the clip output and
the inputs.
To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during a period of
≥
150 ms (charging the input capacitors at pins
10, 11, 13 and 14).
handbook, full pagewidth
MGM564
OUT1
+
RL = 4
Ω
OUT1
−
+
−
+
−
Vref
2
IN1
input 1
IN2
input 2
4
15
10
MODE
2200
µ
F
100 nF
23
+
14.4 V
16
8
1
VP1
VP2
VP3
VP4
VP
30 k
Ω
OUT2
+
RL = 4
Ω
OUT2
−
+
−
+
−
7
5
11
30 k
Ω
21
18
6
3
PGND1
PGND2
PGND3
PGND4
power ground (substrate)
OUT3
+
RL = 4
Ω
OUT3
−
+
−
+
−
Vref
17
IN3
SGND
TDA8571J
input 3
IN4
input 4
19
13
12
30 k
Ω
OUT4
+
RL = 4
Ω
OUT4
−
+
−
+
−
22
20
14
30 k
Ω
10 k
Ω
VDIAG
+
VP
DIAGNOSTIC
diagnostic
output
9
470 nF
470 nF
470 nF
470 nF
1998 Mar 13
11
Philips Semiconductors