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TDA7052A Datasheet(PDF) 4 Page - NXP Semiconductors |
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TDA7052A Datasheet(HTML) 4 Page - NXP Semiconductors |
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July 1994 4 Philips Semiconductors Product specification 1 W BTL mono audio amplifier with DC volume control TDA7052A/AT FUNCTIONAL DESCRIPTION The 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 VALUES In accordance with the Absolute Maximum System (IEC 134) SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VP supply voltage range − 18 V IORM repetitive peak output current − 1.25 A IOSM non-repetitive peak output current − 1.5 A Ptot total power dissipation Tamb ≤ 25% TDA7052A − 1.25 W TDA7052AT − 0.8 W Tamb operating ambient temperature range −40 +85 °C Tstg storage temperature range −55 +150 °C Tvj virtual junction temperature − +150 °C Tsc short-circuit time − 1hr V2 input voltage pin 2 − 8V V4 input voltage pin 4 − 8V |
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