TDA8571J_2.pdf

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INTEGRATED CIRCUITS
DATA SHEET
40 W BTL quad car radio power
amplifier
Product specification
Supersedes data of 1998 Mar 13
2002 Mar 05
TDA8571J
4
´
412422675.051.png
Philips Semiconductors
Product specification
40 W BTL quad car radio power
amplifier
´
TDA8571J
FEATURES
GENERAL DESCRIPTION
·
Requires very few external components
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
·
High output power
·
Low output offset voltage
·
Fixed gain
W
load.
·
Diagnostic facility (distortion, short-circuit and
temperature pre-warning)
APPLICATIONS
·
Good ripple rejection
·
Primarily developed for car radio applications.
·
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.
QUICK REFERENCE DATA
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
m
A
I sw
switch-on current
-
-
80
m
A
ï
Z i ï
input impedance
25
30
-
k
W
P o(EIAJ)
EIAJ output power
THD = maximum
-
40
-
W
SVRR
supply voltage ripple rejection
R s =0
W
-
50
-
dB
a cs
channel separation
R s =10k
W
-
50
-
dB
G v(cl)
closed-loop voltage gain
33
34
35
dB
V n(o)
noise output voltage
R s =0 W
-
-
170
m V
ï
V OS ï
DC output offset voltage
MUTE
-
-
80
mV
ïD
V OS ï
delta DC output offset voltage
ON
«
MUTE
-
-
80
mV
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8571J DBS23P plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm)
SOT411-1
2002 Mar 05
2
4
412422675.062.png
Philips Semiconductors
Product specification
40 W BTL quad car radio power
amplifier
´
TDA8571J
BLOCK DIAGRAM
handbook, full pagewidth
MODE
V P1
V P2
V P3
V P4
15
1
8
16
23
10
+
IN1
2
OUT1 +
-
30 k
W
+
4
OUT1
-
-
V ref
11
+
IN2
7
OUT2 +
-
30 k
W
+
5
OUT2
-
-
12
SGND
9
TDA8571J
DIAGNOSTIC
V DIAG
IN3
13
+
17
OUT3
+
-
30 k W
+
19
OUT3 -
-
V ref
14
IN4
+
22
OUT4
+
-
30 k W
+
20
OUT4 -
-
3
6
18
21
PGND1 PGND2 PGND3 PGND4
MGM562
Fig.1 Block diagram.
2002 Mar 05
3
4
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Philips Semiconductors
Product specification
40 W BTL quad car radio power
amplifier
´
TDA8571J
PINNING
SYMBOL
PIN
DESCRIPTION
handbook, halfpage
V P1
1
supply voltage 1
V P1
OUT1
1
OUT1+
2
output 1+
+
2
PGND1
3
power ground 1
PGND1
3
OUT1
-
4
output 1
-
OUT1
-
4
OUT2 -
5
output 2 -
OUT2
-
5
PGND2
6
power ground 2
PGND2
6
OUT2+
7
output 2+
V P2
8
supply voltage 2
OUT2 +
7
V DIAG
9
diagnostic output
V P2
V DIAG
8
IN1
10
input 1
9
IN2
11
input 2
IN1
10
SGND
12
signal ground
IN2
11
IN3
13
input 3
SGND
12
TDA8571J
IN4
14
input 4
IN3
13
MODE
15
mode select switch input
V P3
16
supply voltage 3
IN4
14
OUT3+
17
output 3+
MODE
15
PGND3
18
power ground 3
V P3
16
OUT3
-
19
output 3
-
OUT3 +
17
OUT4
-
20
output 4
-
PGND3
18
PGND4
21
power ground 4
OUT3 -
19
OUT4+
22
output 4+
OUT4
-
20
V P4
23
supply voltage 4
PGND4
21
OUT4
+
22
V P4
23
MGM563
Fig.2 Pin configuration.
2002 Mar 05
4
4
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Philips Semiconductors
Product specification
40 W BTL quad car radio power
amplifier
´
TDA8571J
FUNCTIONAL DESCRIPTION
S HORT - CIRCUIT DIAGNOSTIC
The TDA8571J contains four identical amplifiers which can
be used for bridge applications. The gain of each amplifier
is fixed at 34 dB.
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 V DIAG 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
Mode select switch (pin MODE)
·
Standby: low supply current (<100
m
A)
Mute: input signal suppressed
· Operating: normal on condition.
Since this pin has a low input current (<80
m
A), a low cost
s to determine whether the short-circuit
is still present. Due to this duty cycle of 50
m
supply switch can be applied.
s/10 ms the
average current consumption during this short-circuit
condition is very low.
During this short-circuit condition, pin V DIAG is LOW for
10 ms and HIGH for 50
m
To avoid switch-on plops, it is advised to keep the amplifier
in the mute mode during ³ 150 ms (charging of the input
capacitors at pins IN1, IN2, IN3 and IN4. When switching
from standby to mute, the slope should be at least 18 V/s.
This can be realized by:
·
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.
m
Microprocessor control
·
External timing circuit (see Fig.3).
Diagnostic output (pin V DIAG )
T EMPERATURE PRE - WARNING
D YNAMIC D ISTORTION D ETECTOR (DDD)
When the virtual junction temperature T vj reaches 145 ° C,
pin V DIAG goes LOW.
At the onset of clipping of one or more output stages, the
dynamic distortion detector becomes active and pin V DIAG
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 V DIAG is independent of the number of channels that
are clipping (see Fig.4).
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.
handbook, halfpage
MGG155
handbook, halfpag + V P
0
10 k
MODE
47
m
F
V 9
BZX79C/3.9V
V P
MGD959
0
t
Fig.3 Mode select switch circuitry.
Fig.4 Distortion detector waveform.
2002 Mar 05
5
4
·
V o
W
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