TDA7056A ,3 W BTL mono audio output amplifier with DC volume control
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TDA7056A ,3 W BTL mono audio output amplifier with DC volume control
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TDA7056A
3 W BTL mono audio output amplifier with DC volume control
NXP Semiconductors Product specificiation
3 W BTL mono audio output amplifier with
DC volume control TDA7056A
FEATURES DC volume control Few external components Mute mode Thermal protection Short-circuit proof No switch-on and off clicks Good overall stability Low power consumption Low HF radiation ESD protected on all pins.
GENERAL DESCRIPTIONThe TDA7056A is a mono BTL output amplifier with DC
volume control. It is designed for use in TV and monitors,
but also suitable for battery-fed portable recorders and
radios.
Missing Current Limiter (MCL)A MCL protection circuits 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 headphone
applications (single-ended).
QUICK REFERENCE DATA
ORDERING INFORMATION
Note SOT110-1.
NXP Semiconductors Product specificiation
3 W BTL mono audio output amplifier with
DC volume control TDA7056A
PINNING
NXP Semiconductors Product specificiation
3 W BTL mono audio output amplifier with
DC volume control TDA7056A
FUNCTIONAL DESCRIPTIONThe TDA7056A is a mono BTL output amplifier with DC
volume control, designed for use in TV and monitor but
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
capacitor to keep the offset voltage low.
In the TDA7056A the DC volume stage is integrated into
the input stage so that coupling capacitors are not required
and a low offset voltage is maintained.
At the same time 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
Thus, a reduced power supply and smaller capacitors can
be used which results in cost savings.
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 dB 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 off clicks, low
HF radiation and a good overall stability.
LIMITING VALUESIn accordance with the Absolute Maximum System (IEC 134).
THERMAL RESISTANCE
Note to the thermal resistanceVP = 12 V; RL = 16 Ω; The maximum sine-wave dissipation is = 1.8 W. The Rth vj-a of the package is 55 K/W;
Tamb (max) = 150 − 55 x 1.8 = 51°C
NXP Semiconductors Product specificiation
3 W BTL mono audio output amplifier with
DC volume control TDA7056A
CHARACTERISTICSVP = 12 V; f = 1 kHz; RL = 16 Ω; Tamb = 25 °C; unless otherwise specified (see Fig.6)
Notes to the characteristics 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 Ω and bandwidth = 5 kHz. The ripple rejection is measured with RS = 0 Ω and f = 100 Hz to 10 kHz. The ripple voltage of 200 mV (RMS value)
is applied to the positive supply rail. The noise output voltage (RMS value) is measured with RS = 5 kΩ unweighted.
NXP Semiconductors Product specificiation
3 W BTL mono audio output amplifier with
DC volume control TDA7056A
