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150kW

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150kW

TPA2006D1

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SLOS498B – SEPTEMBER 2006 – REVISED SEPTEMBER 2015

9 Detailed Description

9.1 Overview

The TPA2006D1 device is a high-efficiency, filter-free, Class-D audio amplifier capable of delivering up to 1.45 W

into 8-

Ω loads with 5-V power supply. Shutdown control is fully compatible with 1.8-V logic levels.

The fully differential design of this amplifier avoids the usage of bypass capacitors and the improved CMRR

eliminates the usage of input coupling capacitors. This makes the device size a perfect choice for small, portable

applications as only three external components are required.

The advanced modulation used in the TPA2006D1 device PWM output stage eliminates the need for an output

filter.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 Fully Differential Amplifier

The TPA2006D1 device 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 on the output that is equal to the differential input times the gain. The

of the common-mode voltage at the input. The fully differential TPA2006D1 device can still be used with a single-

ended input; however, the TPA2006D1 device must be used with differential inputs when in a noisy environment,

like a wireless handset, to ensure maximum noise rejection.

9.3.1.1 Advantages of Fully Differential Amplifiers

•

Input-coupling capacitors not required:

–

The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. For example,

if a codec has a mid-supply lower than the mid-supply of the TPA2006D1 device, the common-mode

feedback circuit will adjust, and the TPA2006D1 device outputs will still be biased at mid-supply of the

inputs are biased outside of that range, input-coupling capacitors are required.

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