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3 W mono BTL audio amplifier with DC volume control
INTEGRATED CIRCUITS
DATA SHEET
TDA7056AT
3 W mono BTL audio amplifier with
DC volume control
Product specification
File under Integrated Circuits, IC01
1998 Feb 23
11041420.034.png
Philips Semiconductors
Product specification
3 W mono BTL audio amplifier with DC
volume control
TDA7056AT
FEATURES
GENERAL DESCRIPTION
·
DC volume control
The TDA7056AT is a mono Bridge-Tied Load (BTL) output
amplifier with DC volume control. It is designed for use in
TVs and monitors, but is also suitable for battery-fed
portable recorders and radios. The device is contained in
a 20-lead small outline package.
·
Few external components
·
Mute mode
·
Thermal protection
·
Short-circuit proof
A Missing Current Limiter (MCL) is built in. The MCL circuit
is activated when the difference in current between the
output terminal of each amplifier exceeds 100 mA
(300 mA typ.). This level of 100 mA allows for
Single-Ended (SE) headphone applications.
·
No switch-on or switch-off clicks
·
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 o
output power
V P = 12 V; R L =16
W
3
3.5
-
W
G v(max)
maximum total voltage gain
V P = 12 V; R L =16
W
34.5
35.5
36.5
dB
D G v
voltage gain control range
75
80
-
dB
I q(tot)
total quiescent current
V P = 12 V; R L =
¥
-
8
16
mA
THD
total harmonic distortion
P o = 0.5 W
-
0.3
1
%
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA7056AT
SO20
plastic small outline package with 20 leads; body width 7.5 mm
SOT163-1
1998 Feb 23
2
11041420.035.png
Philips Semiconductors
Product specification
3 W mono BTL audio amplifier with DC
volume control
TDA7056AT
BLOCK DIAGRAM
handbook, full pagewidth
n.c.
V P
1 to 3, 8 to 13,
16, 18 to 20
4
TDA7056AT
I
+
i
14
+
positive output
positive input
5
7
+
DC volume control
-
I
-
i
17
-
negative output
+
V re f
STABILIZER
TEMPERATURE
PROTECTION
6
15
MGM576
signal
ground
power
ground
Fig.1 Block diagram.
1998 Feb 23
3
11041420.036.png 11041420.037.png 11041420.001.png 11041420.002.png 11041420.003.png 11041420.004.png 11041420.005.png 11041420.006.png 11041420.007.png 11041420.008.png 11041420.009.png 11041420.010.png 11041420.011.png 11041420.012.png 11041420.013.png 11041420.014.png 11041420.015.png 11041420.016.png
Philips Semiconductors
Product specification
3 W mono BTL audio amplifier with DC
volume control
TDA7056AT
PINNING
SYMBOL
PIN
DESCRIPTION
n.c.
1
not connected
n.c.
2
not connected
n.c.
3
not connected
handbook, halfpage
n.c.
1
20
n.c.
V P
4
positive supply voltage
n.c.
2
19
n.c.
V I
5
positive input
GND1
6
signal ground
n.c.
3
18
n.c.
VC
7
DC volume control
V P
4
17
OUT -
n.c.
8
not connected
V I
5
16
n.c.
TDA7056AT
n.c.
9
not connected
GND1
6
15
GND2
n.c.
10
not connected
VC
7
14
OUT +
n.c.
11
not connected
n.c.
8
13
n.c.
n.c.
12
not connected
n.c.
9
12
n.c.
n.c.
13
not connected
OUT+
14
positive output
n.c.
10
11
n.c.
GND2
15
power ground
MGM577
n.c.
16
not connected
OUT
-
17
negative output
n.c.
18
not connected
n.c.
19
not connected
Fig.2 Pin configuration.
n.c.
20
not connected
1998 Feb 23
4
11041420.017.png 11041420.018.png 11041420.019.png 11041420.020.png 11041420.021.png 11041420.022.png 11041420.023.png 11041420.024.png 11041420.025.png 11041420.026.png 11041420.027.png 11041420.028.png 11041420.029.png 11041420.030.png 11041420.031.png 11041420.032.png
Philips Semiconductors
Product specification
3 W mono BTL audio amplifier with DC
volume control
TDA7056AT
FUNCTIONAL DESCRIPTION
The maximum gain of the amplifier is fixed at 35.5 dB.
The DC volume control stage has a logarithmic control
characteristic.
The TDA7056AT is a mono BTL output amplifier with DC
volume control. It is designed for use in TVs and monitors
but is also suitable for battery-fed portable recorders and
radios.
The total gain can be controlled from +35.5 to - 44 dB.
If the DC volume control voltage is below 0.3 V, the device
switches to the mute mode.
In conventional DC volume circuits the control or input
stage is AC-coupled to the output stage via external
capacitors to keep the offset voltage low. In the
TDA7056AT the DC volume control stage is integrated into
the input stage so that no coupling capacitors are required.
With this configuration, a low offset voltage is still
maintained and the minimum supply voltage remains low.
The BTL principle offers the following advantages:
·
C the gain will be reduced, thereby reducing the
output power. 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
Power dissipation
·
The frequency of the ripple on the supply voltage is twice
the signal frequency.
Assume V P = 12 V; R L =16 W .
The maximum sine wave dissipation is 1.8 W.
Consequently, a reduced power supply with smaller
capacitors can be used which also results in cost
reductions. 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.
The R th vj-a of the package is 60 K/W.
Therefore T amb(max) = 150
-
60
´
1.8=42
°
C.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V P
supply voltage
-
18
V
V 5, 7
input voltage pins 5 and 7
-
5
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
-
1.5
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
h
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
VALUE
UNIT
R th(j-a)
thermal resistance from junction to ambient
in free air
60
K/W
1998 Feb 23
5
The amplifier is short-circuit proof to ground, V P and
across the load. A thermal protection circuit is also
implemented. If the crystal temperature rises above
+150
11041420.033.png

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