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TDA7052AT
1 W BTL mono audio amplifier with DC volume control
NXP Semiconductors Product specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
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 TDA7052A/AT are mono BTL output amplifiers with
DC volume control. They are designed for use in TV and
monitors, but also suitable for battery-fed portable
recorders and radios.
Missing Current Limiter (MCL)A MCL protection circuit 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
Notes SOT97-1. SOT96-1.
NXP Semiconductors Product specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
PINNING
NXP Semiconductors Product specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
FUNCTIONAL DESCRIPTIONThe TDA7052A/AT are mono BTL output amplifiers with
DC volume control, designed for use in TV and monitors
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
capacitors to keep the offset voltage low.
In the TDA7052A/AT the DC volume control stage is
integrated into the input stage so that no coupling
capacitors are required and yet a low offset voltage is
maintained. At the same time the minimum supply 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 with 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. Also a thermal protection circuit is
implemented. If the crystal temperature rises above
+150 °C the gain will be reduced, so the output power is
reduced.
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)
NXP Semiconductors Product specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
THERMAL RESISTANCE
Notes to the thermal resistanceTDA7052A: VP = 6 V; RL = 8 Ω. The maximum sine-wave dissipation is 0.9 W.
Therefore Tamb(max) = 150 − 100 × 0.9 = 60 °C.
TDA7052AT: VP = 6 V; RL = 16 Ω. The maximum sine-wave dissipation is 0.46 W.
Therefore Tamb(max) = 150 − 155 × 0.46 = 78 °C.
NXP Semiconductors Product specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
CHARACTERISTICSVP = 6 V; Tamb = 25 °C; f = 1 kHz; TDA7052A: RL = 8 Ω; TDA7052AT: RL = 16 Ω; 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 dividend 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 specification
1 W BTL mono audio amplifier with DC
volume control TDA7052A/AT
