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TPA6204A1DRBRG4 датащи(PDF) 9 Page - Texas Instruments

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номер детали TPA6204A1DRBRG4
подробное описание детали  1.7-W Mono Fully Differential Audio Power Amplifier
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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TPA6204A1
www.ti.com
SLOS429C – MAY 2004 – REVISED MAY 2016
Product Folder Links: TPA6204A1
Submit Documentation Feedback
Copyright © 2004–2016 , Texas Instruments Incorporated
9 Detailed Description
9.1 Overview
The TPA6204A1 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 Advantages of Fully Differential Amplifiers
Input coupling capacitors not required: A fully differential amplifier with good CMRR, like the TPA6204A1,
allows the inputs to be biased at voltage other than mid-supply. For example, if a DAC has mid-supply lower
than the mid-supply of the TPA6204A1, the common-mode feedback circuit adjusts for that, and the
TPA6204A1 outputs are still biased at mid-supply of the TPA6204A1. The inputs of the TPA6204A1 can be
biased from 0.5 V to VDD
− 0.8 V. If the inputs are biased outside of that range, input coupling capacitors are
required.
Mid-supply bypass capacitor, C(BYPASS), not required: The fully differential amplifier does not require a
bypass capacitor. This is because any shift in the mid-supply affects both positive and negative channels
equally and cancels at the differential output. It is important to remember that removing the bypass capacitor
slightly worsens the kSVR. A slight decrease of kSVR, however, may be acceptable when an additional
component can be eliminated.
Better RF-immunity: GSM handsets save power by turning on and shutting off the RF transmitter at a rate of
217 Hz. The transmitted signal is picked up on input and output traces. The fully differential amplifier cancels
the signal much better than the typical audio amplifier.
9.3.2 Fully Differential Amplifier Efficiency and Thermal Information
Class-AB amplifiers are inefficient. The primary cause of these inefficiencies is voltage drop across the output
stage transistors. There are two components of the internal voltage drop. One is the headroom or DC voltage
drop that varies inversely to output power. The second component is due to 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.


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