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TPA751 Datasheet(PDF) 14 Page - Texas Instruments |
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TPA751 Datasheet(HTML) 14 Page - Texas Instruments |
14 / 32 page TPA751 700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS SLOS336C – DECEMBER 2000 – REVISED OCTOBER 2002 14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION BTL amplifier efficiency (continued) Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are very different between SE and BTL configurations. In an SE application, the current waveform is a half-wave rectified shape, whereas in BTL it is a full-wave rectified waveform. This means RMS conversion factors are different. Keep in mind that for most of the waveform both the push and pull transistors are not on at the same time, which supports the fact that each amplifier in the BTL device only draws current from the supply for half the waveform. The following equations are the basis for calculating amplifier efficiency. Efficiency of a BTL amplifier + P L P SUP (3) where (4) P L + V L rms2 R L , and V LRMS + V P 2 , therefore, P L + V P 2 2R L PL = Power delivered to load PSUP = Power drawn from power supply VLRMS = RMS voltage on BTL load RL = Load resistance VP = Peak voltage on BTL load IDDavg = Average current drawn from the power supply VDD = Power supply voltage ηBTL = Efficiency of a BTL amplifier and PSUP + VDD IDDavg and IDDavg + 1 p p 0 V P R L sin(t) dt + 1p V P R L [cos(t)] p 0 + 2V P p R L therefore, P SUP + 2V DD V P p R L substituting PL and PSUP into equation 7, Efficiency of a BTL amplifier + V P 2 2R L 2V DD VP p R L + p V P 4V DD V P + 2P L R L h BTL + p 2P L R L 4V DD where therefore, |
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