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TDA7056AT
3 W mono BTL audio amplifier with DC volume control
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
FEATURES DC volume control Few external components Mute mode Thermal protection Short-circuit proof No switch-on or switch-off clicks Good overall stability Low power consumption Low HF radiation ESD protected on all pins.
GENERAL DESCRIPTIONThe 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.
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.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
BLOCK DIAGRAM
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
PINNING
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
FUNCTIONAL DESCRIPTIONThe 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 +35.5to −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 dissipationAssume VP=12 V; RL =16Ω.
The maximum sine wave dissipation is 1.8W.
The Rth vj-a of the package is 60 K/W.
Therefore Tamb(max)= 150−60× 1.8=42 °C.
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).
THERMAL CHARACTERISTICS
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
CHARACTERISTICS=12 V; VDC= 1.4 V; f=1 kHz; RL =16 Ω; Tamb =25 °C; unless otherwise specified (see Fig.14).
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 (Vn(o)(rms)) at f= 500 kHz, is measured with Rs =0 Ω and B=5 kHz. The ripple rejection is measured with Rs =0 Ω and f= 100Hzto10 kHz. The ripple voltage (Vripple= 200 mV RMS)
is applied to the positive supply rail. The noise output voltage (Vn(o)(rms)) is measured with Rs =5kΩ unweighted.
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
Philips Semiconductors Product specification
3 W mono BTL audio amplifier with DC
volume control TDA7056AT
