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TDA7056AT Arkusz danych(PDF) 5 Page - NXP Semiconductors |
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TDA7056AT Arkusz danych(HTML) 5 Page - NXP Semiconductors |
5 / 18 page 1998 Feb 23 5 NXP Semiconductors Product specification 3 W mono BTL audio amplifier with DC volume control TDA7056AT FUNCTIONAL DESCRIPTION The 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 +35.5 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 switch-off clicks, low HF radiation and a good overall stability. Power dissipation Assume VP =12V; RL =16 Ω. The maximum sine wave dissipation is 1.8 W. The Rth vj-a of the package is 60 K/W. Therefore Tamb(max) =150 − 60 × 1.8 = 42 °C. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). THERMAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VP supply voltage − 18 V V5, 7 input voltage pins 5 and 7 − 5V IORM repetitive peak output current − 1.25 A IOSM non-repetitive peak output current − 1.5 A Ptot total power dissipation Tcase < 60 °C − 1.5 W Tamb operating ambient temperature −40 +85 °C Tstg storage temperature −55 +150 °C Tvj virtual junction temperature − 150 °C tsc short-circuit time − 1h SYMBOL PARAMETER CONDITIONS VALUE UNIT Rth(j-a) thermal resistance from junction to ambient in free air 60 K/W |
Podobny numer części - TDA7056AT_15 |
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Podobny opis - TDA7056AT_15 |
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