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TPA6211A1DGN Datasheet(PDF) 12 Page - Texas Instruments |
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TPA6211A1DGN Datasheet(HTML) 12 Page - Texas Instruments |
12 / 37 page 40 NŸ Bias Circuitry 40 NŸ 100 NŸ + _ IN+ IN- SHUTDOWN BYPASS VDD Vo+ Vo- GND TPA6211A1 SLOS367E – AUGUST 2003 – REVISED NOVEMBER 2015 www.ti.com 9 Detailed Description 9.1 Overview The TPA6211A1 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier consists of a differential amplifier and a common- mode amplifier. The differential amplifier ensures that the amplifier outputs a differential voltage that is equal to the differential input times the gain. The common-mode feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the common- mode voltage at the input. 9.2 Functional Block Diagram 9.3 Feature Description 9.3.1 Fully Differential Amplifier Efficiency and Thermal Information Class-AB amplifiers are inefficient, primarily because of voltage drop across the output-stage transistors. The two components of this internal voltage drop are the headroom or dc voltage drop that varies inversely to output power, and the sinewave nature of the output. The total voltage drop can be calculated by 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), determines the internal power dissipation of the amplifier. 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 28). 12 Submit Documentation Feedback Copyright © 2003–2015, Texas Instruments Incorporated Product Folder Links: TPA6211A1 |
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