TDA7057AQ, Elektronika i elektryka, Serwisówki
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INTEGRATED CIRCUITS
DATA SHEET
TDA7057AQ
2
8 W stereo BTL audio output
amplifier with DC volume control
´
1998 Apr 07
Product specification
Supersedes data of 1997 July 15
File under Integrated Circuits, IC01
Philips Semiconductors
Product specification
2
8 W stereo BTL audio output amplifier
with DC volume control
´
TDA7057AQ
FEATURES
GENERAL DESCRIPTION
·
DC volume control
The TDA7057AQ is a stereo BTL output amplifier with DC
volume control. The device is designed for use in TVs and
monitors, but is also suitable for battery-fed portable
recorders and radios.
·
Few external components
Mute mode
·
·
Thermal protection
Missing Current Limiter (MCL)
·
Short-circuit proof
No switch-on and switch-off clicks
·
A MCL protection circuit is built-in. The MCL circuit is
activated when the difference in current between the
output terminal of each amplifier exceeds 100 mA
(typical 300 mA). This level of 100 mA allows for
single-ended headphone applications.
·
Good overall stability
·
Low power consumption
Low HF radiation
·
·
ESD protected on all pins.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage
4.5
-
18
V
P
out
output power
V
P
= 12 V; R
L
=16
W
3.0
3.5
-
W
V
P
= 12 V; R
L
=8
W-
5.3
-
W
V
P
= 15 V; R
L
=8
W-
8
-
W
voltage gain
39.5
40.5
41.5
dB
v
D
G
v
voltage gain control
68
73.5
-
dB
I
q(tot)
total quiescent current
V
P
= 12 V; R
L
=
¥
-
22
25
mA
THD
total harmonic distortion
P
o
= 0.5 W
-
0.3
1
%
ORDERING INFORMATION
PACKAGE
TYPE
NUMBER
NAME
DESCRIPTION
VERSION
TDA7057AQ
DBS13P
plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm)
SOT141-6
1998 Apr 07
2
Philips Semiconductors
Product specification
2
8 W stereo BTL audio output amplifier
with DC volume control
´
TDA7057AQ
BLOCK DIAGRAM
V
P
handbook, full pagewidth
4
TDA7057AQ
I i
13
positive
output 1
3
input 1
DC volume
control 1
1
I
I i
11
negative
output 1
TEMPERATURE
PROTECTION
STABILIZER
V
ref
I i
10
negative
output 2
5
input 2
DC volume
control 2
7
II
I i
8
positive
output 2
2
6
12
9
MSA714
not
connected
signal
ground
power
ground 1
power
ground 2
Fig.1 Block diagram.
1998 Apr 07
3
Philips Semiconductors
Product specification
2
8 W stereo BTL audio output amplifier
with DC volume control
´
TDA7057AQ
PINNING
SYMBOL
PIN
DESCRIPTION
VC1
1
DC volume control 1
handbook, halfpage
VC1
1
n.c.
2
not connected
n.c.
2
V
l (1)
3
voltage input 1
V
I (1)
3
V
P
4
positive supply voltage
V
P
4
V
l (2)
5
voltage input 2
V
I (2)
5
SGND
6
signal ground
VC2
7
DC volume control 2
6
SGND
OUT2+
8
positive output 2
VC2
7
TDA7057AQ
PGND2
9
power ground 2
OUT2
8
OUT2
-
10
negative output 2
PGND2
9
OUT1
-
11
negative output 1
OUT2
10
PGND1
12
power ground 1
OUT1
11
OUT1
+
13
positive output 1
PGND1
12
OUT1
13
MSA716
Fig.2 Pin configuration.
For portable applications there is a trend to decrease the
supply voltage, resulting in a reduction of output power at
conventional output stages. Using the BTL principle
increases the output power.
FUNCTIONAL DESCRIPTION
The TDA7057AQ is a stereo output amplifier with two DC
volume control stages. The device is designed for TVs and
monitors, but is also suitable for battery-fed portable
recorders and radios.
In conventional DC volume control circuits the control or
input stage is AC-coupled to the output stage via external
capacitors to keep the offset voltage low.
The maximum gain of the amplifier is fixed at 40.5 dB.
The DC volume control stages have a logarithmic control
characteristic. Therefore, the total gain can be controlled
from +40.5 dB to
-
33 dB. If the DC volume control voltage
falls below 0.4 V, the device will switch to the mute mode.
In the TDA7057AQ the two DC volume control stages are
integrated into the input stages so that no coupling
capacitors are required and a low offset voltage is still
maintained. The minimum supply voltage also remains
low.
The amplifier is a short-circuit protected to ground, V
P
and
across the load. A thermal protection circuit is also
implemented. If the crystal temperature rises above
+150
C the gain will be reduced, thereby reducing the
output power.
°
The BTL principle offers the following advantages:
·
Special attention is given to switch-on and switch-off
clicks, low HF radiation and a good overall stability.
Lower peak value of the supply current
·
The frequency of the ripple on the supply voltage is twice
the signal frequency.
Consequently, a reduced power supply with smaller
capacitors can be used which results in cost reductions.
1998 Apr 07
4
Philips Semiconductors
Product specification
2
8 W stereo BTL audio output amplifier
with DC volume control
´
TDA7057AQ
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
supply voltage
18
V
-
I
ORM
repetitive peak output current
-
1.25
A
I
OSM
non-repetitive peak output current
-
1.5
A
P
tot
total power dissipation
T
case
<60
°
C
-
22.5
W
T
amb
operating ambient temperature
40
+85
C
-
°
T
stg
storage temperature
-
55
+150
°
C
T
vj
virtual junction temperature
-
150
°
C
t
sc
short-circuit time
-
1
hr
V
n
input voltage pins 1, 3, 5 and 7
5
V
-
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
VALUE
UNIT
R
th j-c
thermal resistance from junction to case
4
K/W
R
th j-a
thermal resistance from junction to ambient in free air
40
K/W
Power dissipation
Assume V
P
= 12 V and R
L
=16
W
. The maximum sine wave dissipation is 2
´
1.8 W = 3.6 W.
At T
amb(max)
=60
°
C:
R
th tot
= (150
-
60)/3.6 = 25 K/W.
R
th tot
=R
th j-c
+R
th c-hs
+R
th hs
.
R
th c-hs
+R
th hs
=25
-
4 = 21 K/W.
1998 Apr 07
5
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