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TDA7056BPHN/a14avai5 W mono BTL audio amplifier with DC volume control


TDA7056B ,5 W mono BTL audio amplifier with DC volume controlGENERAL DESCRIPTION DC volume control The TDA7056B is a mono Bridge-Tied Load (BTL) output amplifi ..
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TDA7056B
5 W mono BTL audio amplifier with DC volume control

NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
FEATURES
DC volume control Few external components Mute mode Thermal protection Short-circuit proof No switch-on and switch-off clicks Good overall stability Low power consumption Low HF radiation ESD protected on all pins.
GENERAL DESCRIPTION

The TDA7056B is a mono Bridge-Tied Load (BTL) output
amplifier with DC volume control.
It is designed for use in TV and monitors, but is also
suitable for battery-fed portable recorders and radios.
The device is contained in a 9-pin medium power package.
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 headphone
applications (single-ended).
QUICK REFERENCE DATA
ORDERING INFORMATION
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
PINNING
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
FUNCTIONAL DESCRIPTION

The TDA7056B is a mono BTL output amplifier with DC
volume control, designed for use in TV and monitor 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 TDA7056B
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 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 40.5 dB.
The DC volume control stage has a logarithmic control
characteristic. Therefore, the total gain can be controlled
from 40.5 dBto 33 dB. If the DC volume control voltage
falls below 0.4 V, the device will switch to the mute mode.
The amplifier is short-circuit proof to ground, VP and
across the load. Also a thermal protection circuit is
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 =12V; RL =16.
The maximum sine wave dissipation is= 1.8 W.
The Rth vj-a of the package is 55 K/W.
Therefore Tamb (max) =15055 1.8=51 C.
LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
CHARACTERISTICS
=12V; VDC= 1.4 V; f=1 kHz; RL =16 ; Tamb =25 C; unless otherwise specified (see Fig.13).
Notes
With a load connected to the outputs the quiescent current will increase, the maximum value of this increase being
equal to the DC output offset voltage divided by RL. The noise output voltage (RMS value) at f= 500 kHz is measured with RS =0  and B=5 kHz. The ripple rejection is measured with RS =0  and f= 100Hzto10 kHz. The ripple voltage VR of 200 mV
(RMS value) is applied to the positive supply rail. The noise output voltage (RMS value) is measured with RS =5k unweighted. The DC volume control can be configured in several ways. Two possible circuits are shown in Figs 14 and 15.
The circuits at the volume control pin will influence the switch-on and switch-off behaviour and the maximum voltage
gain.
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
NXP Semiconductors Product specification
5 W mono BTL audio amplifier with DC
volume control TDA7056B
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