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Número de pieza TDA7056AT
Descripción 3 W mono BTL audio amplifier with DC volume control
Fabricantes NXP Semiconductors 
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INTEGRATED CIRCUITS
DATA SHEET
TDA7056AT
3 W mono BTL audio amplifier with
DC volume control
Product specification
1998 Feb 23

1 page




TDA7056AT pdf
NXP Semiconductors
3 W mono BTL audio amplifier with DC
volume control
Product specification
TDA7056AT
FUNCTIONAL DESCRIPTION
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.
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:
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 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 maximum gain of the amplifier is fixed at 35.5 dB.
The DC volume control stage has a logarithmic control
characteristic.
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.
The amplifier is short-circuit proof to ground, VP 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. Special attention is given to switch-on and
switch-off clicks, low HF radiation and a good overall
stability.
Power dissipation
Assume VP = 12 V; RL = 16 Ω.
The maximum sine wave dissipation is 1.8 W.
The Rth vj-a of the package is 60 K/W.
Therefore Tamb(max) = 150 60 × 1.8 = 42 °C.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VP
V5, 7
IORM
IOSM
Ptot
Tamb
Tstg
Tvj
tsc
PARAMETER
supply voltage
input voltage pins 5 and 7
repetitive peak output current
non-repetitive peak output current
total power dissipation
operating ambient temperature
storage temperature
virtual junction temperature
short-circuit time
CONDITIONS
Tcase < 60 °C
MIN.
40
55
MAX.
18
5
1.25
1.5
1.5
+85
+150
150
1
UNIT
V
V
A
A
W
°C
°C
°C
h
THERMAL CHARACTERISTICS
SYMBOL
Rth(j-a)
PARAMETER
thermal resistance from junction to ambient
CONDITIONS
in free air
VALUE
60
UNIT
K/W
1998 Feb 23
5

5 Page





TDA7056AT arduino
NXP Semiconductors
3 W mono BTL audio amplifier with DC
volume control
Product specification
TDA7056AT
TEST AND APPLICATION INFORMATION
Test conditions
Tamb = 25 °C if not specified: VP = 12 V; VDC = 1.4 V;
f = 1 kHz; RL = 16 Ω; audio bandpass: 22 Hz to 22 kHz.
In Figures 5 and 6 a low-pass filter of 80 kHz was applied.
It should be noted that capacitive loads (100 pF and 5 nF)
connected between the output pins to a common ground
can cause oscillations. The BTL application circuit diagram
is shown in Fig.14. To avoid instabilities and too high
distortion, the input and power ground traces must be
separated as far as possible and connected together as
close as possible to the IC. The quiescent current has
been measured without load impedance.
Voltage gain
The maximum closed-loop voltage gain has been
internally fixed at 35.5 dB. The input sensitivity at
maximum gain for Po = 3 W (RL = 16 Ω) is 115 mV.
The gain bandwidth is 20 Hz to 300 kHz within 1 dB.
Output power
The output power as a function of supply voltage has been
measured at THD = 10%. The maximum output power is
limited by the maximum allowed power dissipation at
Tamb = 25 °C approximately 2 W, and the maximum
available output current is 1.25 A repetitive peak current.
Switch-on/switch-off
The switch-on behaviour depends on the following:
The rise time of the power supply (if tr > 40 ms for
VP = 0 to 12 V then the switch-on behaviour will be
good)
The input capacitor and source impedance (a higher
source impedance and/or lower input capacitor value
will have a positive influence on the switch-on/switch-off
behaviour)
The DC volume control pin (a capacitor of >0.1 μF
avoids disturbances).
Thermal behaviour:
The measured thermal resistance of the IC package is
highly dependent on the configuration and size of the
application board. Data may not be comparable between
different semiconductors manufacturers because the
application boards and test methods are not (yet)
standardized. The thermal performance of packages for a
specific application may also be different than presented
here, because the configuration of the application boards
(copper area) may be different. NXP Semiconductors uses
FR-4 type application boards with 1 oz copper traces with
solder coating. The measurements have been carried out
with vertical placed boards.
Using a practical PCB layout with wider copper tracks and
some copper area to the IC pins and just under the IC, the
thermal resistance from junction to ambient can be
reduced. In the demonstration application PCB the
Rth(j-a) = 56 K/W for the SO20 plastic package. For a
maximum ambient temperature of Tamb = 50 °C the
following calculation can be made for the maximum power
dissipation: (---1---5----0-----K----/-W------------5---0-----K----/--W------) = 1.79 W
56 K/W
For the application at VP = 12 V and RL = 16 Ω the worst
case sine wave dissipation is 1.85 W. Because in practice
the ‘music-power’ causes about the half of the sine wave
dissipation, this application (VP = 12 V; RL = 16 Ω) has
been allowed.
Short-circuit protection:
The output pins (pins 14 and 17) can be short-circuited to
ground respectively to +VP. The Missing Current Limiter
(MCL) protection circuit will shut-off the amplifier.
Removing the short-circuit will reset the amplifier
automatically. Short-circuit across the load
(pins 14 and 17) will activate the thermal protection circuit;
this will result in reducing the short-circuit current.
1998 Feb 23
11

11 Page







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