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TPA6211A1 Datasheet(PDF) 18 Page - Texas Instruments |
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TPA6211A1 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 32 page  RL CC VO(PP) VO(PP) VDD -3 dB fc V(LRMS) VO IDD IDD(avg) TPA6211A1 SLOS367D – AUGUST 2003 – REVISED JUNE 2011 www.ti.com For example, a 68- μF capacitor with an 8-Ω speaker subtracting the RMS value of the output voltage from would attenuate low frequencies below 293 Hz. The VDD. The internal voltage drop multiplied by the BTL configuration cancels the dc offsets, which average value of the supply current, IDD(avg), eliminates the need for the blocking capacitors. determines the internal power dissipation of the Low-frequency performance is then limited only by amplifier. the input network and speaker response. Cost and An easy-to-use equation to calculate efficiency starts PCB space are also minimized by eliminating the out as being equal to the ratio of power from the bulky coupling capacitor. 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 Figure 35. Voltage and Current Waveforms for Response BTL Amplifiers Increasing power to the load does carry a penalty of Although the voltages and currents for SE and BTL increased internal power dissipation. The increased are sinusoidal in the load, currents from the supply dissipation is understandable considering that the are different between SE and BTL configurations. In BTL configuration produces 4 × the output power of an SE application the current waveform is a the SE configuration. 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 FULLY DIFFERENTIAL AMPLIFIER most of the waveform both the push and pull EFFICIENCY AND THERMAL INFORMATION transistors are not on at the same time, which Class-AB amplifiers are inefficient, primarily because supports the fact that each amplifier in the BTL of voltage drop across the output-stage transistors. device only draws current from the supply for half the The two components of this internal voltage drop are waveform. The following equations are the basis for the headroom or dc voltage drop that varies inversely calculating amplifier efficiency. to output power, and the sinewave nature of the output. The total voltage drop can be calculated by 18 Copyright © 2003–2011, Texas Instruments Incorporated |
Similar Part No. - TPA6211A1_15 |
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Similar Description - TPA6211A1_15 |
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