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TDA7052B Arkusz danych(PDF) 4 Page - NXP Semiconductors |
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4 / 16 page 1997 Aug 15 4 Philips Semiconductors Product specification Mono BTL audio amplifier with DC volume control TDA7052B FUNCTIONAL DESCRIPTION The TDA7052B and TDA7052BT are mono BTL output amplifiers with DC volume control which have been designed for use in TV and monitors but are also suitable for use in 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 TDA7052B and TDA7052BT 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 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 for the TDA7052B that VP = 6 V; RL =8 Ω. The maximum sine wave dissipation is 0.9 W. The Rth j-a of the package is 100 K/W. Therefore Tamb(max) = 150 − 100 × 0.9 = 60 °C. Assume for the TDA7052BT that VP = 6 V; RL =16 Ω. The maximum sine wave dissipation is 0.46 W. The Rth j-a of the package is 155 K/W. Therefore Tamb(max) = 150 − 155 × 0.46 = 78 °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 V2, 4 input voltage pins 2 and 4 − 5V IORM repetitive peak output current − 1.25 A IOSM non-repetitive peak output current − 1.5 A Ptot total power dissipation Tamb ≤ 25 °C TDA7052B − 1.25 W TDA7052BT − 0.8 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 VALUE UNIT Rth j-a thermal resistance from junction to ambient in free air TDA7052B 100 K/W TDA7052BT 155 K/W |
Podobny numer części - TDA7052B |
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Podobny opis - TDA7052B |
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