40

NŸ

Bias

Circuitry

40

NŸ

100

NŸ

+

_

IN+

IN-

SHUTDOWN

BYPASS

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

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

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

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