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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA7056B Fiches technique(PDF) 4 Page - NXP Semiconductors |
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TDA7056B Fiches technique(HTML) 4 Page - NXP Semiconductors |
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4 / 16 page  1997 Aug 15 4 Philips Semiconductors Product specification 5 W mono BTL audio amplifier with DC volume control TDA7056B FUNCTIONAL DESCRIPTION The TDA7056B is a mono BTL output amplifier with DC volume control, designed for use in TV and monitor 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 TDA7056B 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 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 40.5 dB. The DC volume control stage has a logarithmic control characteristic. Therefore, the total gain can be controlled from 40.5 dB to −33 dB. If the DC volume control voltage falls below 0.4 V, the device will switch 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, 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 = 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. Therefore Tamb (max) = 150 − 55 × 1.8 = 51 °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 V3, 5 input voltage pins 3 and 5 − 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 − 9W 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 VALUE UNIT Rth j-a thermal resistance from junction to ambient in free air 55 K/W Rth j-c thermal resistance from junction to case 10 K/W |
Numéro de pièce similaire - TDA7056B |
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Description similaire - TDA7056B |
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