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TDA7056A Scheda tecnica(PDF) 4 Page - NXP Semiconductors |
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TDA7056A Scheda tecnica(HTML) 4 Page - NXP Semiconductors |
4 / 9 page July 1994 4 Philips Semiconductors Product specificiation 3 W BTL mono audio output amplifier with DC volume control TDA7056A FUNCTIONAL DESCRIPTION The 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 VALUES In accordance with the Absolute Maximum System (IEC 134). THERMAL RESISTANCE Note to the thermal resistance VP = 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 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 Tcase < 60 °C − 9W 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 V3 input voltage pin 3 − 8V V5 input voltage pin 5 − 8V SYMBOL PARAMETER THERMAL RESISTANCE Rth j-a from junction to ambient in free air 55 K/W Rth j-c from junction to case 10 K/W |
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