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TPA6211A1DRB Datasheet(PDF) 18 Page - Texas Instruments |
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TPA6211A1DRB Datasheet(HTML) 18 Page - Texas Instruments |
18 / 29 page www.ti.com RL CC VO(PP) VO(PP) VDD -3 dB fc V(LRMS) VO IDD IDD(avg) FULLY DIFFERENTIAL AMPLIFIER TPA6211A1 SLOS367B – AUGUST 2003 – REVISED AUGUST 2004 An easy-to-use equation to calculate efficiency starts out as being equal to the ratio of power from the power supply to the power delivered to the load. To accurately calculate the RMS and average values of power in the load and in the amplifier, the current and voltage waveform shapes must first be understood (see Figure 35). Figure 34. Single-Ended Output and Frequency Response Figure 35. Voltage and Current Waveforms for Increasing power to the load does carry a penalty of BTL Amplifiers increased internal power dissipation. The increased dissipation is understandable considering that the Although the voltages and currents for SE and BTL BTL configuration produces 4 × the output power of are sinusoidal in the load, currents from the supply the SE configuration. are 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 EFFICIENCY AND THERMAL INFORMATION full-wave rectified waveform. This means RMS con- version factors are different. Keep in mind that for Class-AB amplifiers are inefficient, primarily because most of the waveform both the push and pull transis- of voltage drop across the output-stage transistors. tors are not on at the same time, which supports the The two components of this internal voltage drop are fact that each amplifier in the BTL device only draws the headroom or dc voltage drop that varies inversely current from the supply for half the waveform. The to output power, and the sinewave nature of the following equations are the basis for calculating output. The total voltage drop can be calculated by amplifier efficiency. subtracting the RMS value of the output voltage from VDD. The internal voltage drop multiplied by the average value of the supply current, IDD(avg), deter- mines the internal power dissipation of the amplifier. 18 |
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