Texas Instruments TPA0202 manual Mute/Mode, Headphone Jack Control Signals

Page 28

Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform

3.3.4Mute/Mode

The TPA0202 EVM is equipped with a mute control input pin. When this input is tied to VDD, the TPA0202 amplifier IC on the module enters the mute mode and dissipates very little power. When the EVM control input is tied to GND or allowed to float, amplifier operation resumes.

In typical applications, as often found in notebook computers, portable audio products, and such, the internal speakers mute when headphones are plugged into the headphone jack, or internal speakers mute when external speakers are connected. In applications using separate speaker and headphone amplifiers, the one not being used can be shut down (muted) to conserve power.

A mode control input pin on the EVM switches the TPA0202 amplifier IC between the bridge-tied load (BTL) output mode and the single-ended (SE) output mode. When the mode control input is tied to GND, the module operates in the BTL output mode. When this input is tied to VDD, the module operates in the single-ended output mode.

In the typical application, output mode switching allows the TPA0202 to operate in the BTL output mode for increased power to internal speakers and then switch to single-ended mode to drive headphones when a plug is inserted into the headphone jack.

3.3.4.1Headphone Jack Control Signals

The platform headphone output jack (J10) contains an internal switch that changes the state of a pair of control lines when a plug is inserted (Figure 3±6). Each control line is pulled down by a 1-kΩresistor to ground (R4 and R5). The switch in the headphone jack pulls one line or the other up to VDD through a 240-Ωresistor (R3) depending on whether a plug is inserted in J10 or not.

Figure 3±7. Mute/Mode and Polarity Control

 

VDD

 

 

R3

Polarity

 

240 Ω

 

JP8

 

 

J10

 

Lo

 

 

Headphone

Jack

 

Hi

R4

R5

SPK

1 kΩ

1 kΩ

(U2±U4)

JP6

Mode

U2

 

 

Power

Mute

Amplifier

 

3-12

Details

Page 27 Page 29
Image 28
Page 27 Page 29
Contents Users Guide Important Notice Preface Related Documentation From Texas InstrumentsIf You Need Assistance Contents Figures TablesIntroduction Feature Highlights Description ±1. The TI TPA0202 Audio Amplifier Evaluation ModuleTPA0202 EVM Specifications Quick Start EVM JP6 JP7 JP8Precautions Audio InputQuick Start List for Platform Platform preparations±4. Typical TPA0202 EVM Jumper Settings Quick Start List for Stand-Alone ±3. Quick Start Module MapControl Inputs Details ±1. The TI Plug-N-Play Audio Amplifier Evaluation Platform TPA0202 Audio Power Amplifier Evaluation Module ±2. TPA0202 EVM±3. TPA0202 EVM Schematic Diagram 1 TPA0202 Audio Amplifier ICDepop Circuitry BTL OperationSIngle-Ended Operation Inputs and GainEVM Insertion Installing and Removing EVM BoardsEVM Removal 2 TPA0202 Module Jumper Settings and Switches ±5. TPA0202 EVM Jumpers and Switches2.2 S2 Ð Mute Switch 2.4 S4 Ð Output Mode Jumper2.1 S1 Ð Shutdown Jumper 2.3 S3 Ð Input Select Jumper2.7 S7 Ð SE Output Mode Switch 2.8 S8 Ð Junction Temperature Measurement Jumper2.5 S5 Ð VDD Bridge Jumper 2.6 S6 Ð Autosense JumperSignal Conditioning Signal RoutingHeadphone Output Jack Headphone Jack Control Signals Mute/ModeMute/Mode Select JP6 Mute/Mode Polarity Select JP8Power Requirements Inputs Inputs and OutputsOutputs Using The TPA0202 EVM Stand-Alone 1 TPA0202 EVM Connected for BTL Output2 TPA0202 EVM Connected for Single-Ended Output ±10. TPA0202 EVM Connected for Stereo Single-Ended OutputTPA0202 Audio Power Amplifier Evaluation Module Parts List ±1. TPA0202 EVM Parts List

TPA0202 specifications

The Texas Instruments TPA0202 is a high-performance Class-D audio amplifier designed for a variety of portable audio applications. Renowned for its efficiency and sound quality, the TPA0202 is an ideal choice for battery-operated devices such as mobile phones, tablet computers, and other handheld devices. With the continuous push for better audio experiences in compact formats, the TPA0202 stands out with its impressive specifications and features.

One of the key characteristics of the TPA0202 is its power efficiency. Operating at a high efficiency rate of up to 90%, this Class-D amplifier minimizes heat generation, allowing it to deliver more power to the audio output while extending battery life. This efficiency is especially crucial for portable devices, where battery performance is a key consideration.

The TPA0202 supports an output power of 2 watts per channel into 4 ohms, making it capable of driving small speakers or headphones with excellent sound quality. The device features a built-in differential input stage that enhances noise immunity, thereby ensuring cleaner audio reproduction. It also supports a wide supply voltage range from 3V to 5.5V, contributing to its versatility in different applications.

In terms of audio quality, the TPA0202 boasts low total harmonic distortion (THD) and exceptional linearity, resulting in rich, clear audio output. Additionally, it comes equipped with selectable gain settings, allowing designers to tailor the amplifier to various output requirements and system designs.

The amplifier also integrates various protection features, including thermal shutdown, short-circuit protection, and undervoltage detection, ensuring robust operation under different conditions. The TPA0202 is also simple to implement in designs, with a minimal external component requirement, further enhancing its appeal to engineers seeking quick and efficient solutions for audio amplification needs.

Moreover, the compact package size of the TPA0202 allows for easy integration into space-constrained designs. With its combination of high efficiency, excellent audio quality, and protective features, the Texas Instruments TPA0202 continues to be a compelling choice for developers looking to enhance audio performance in portable and battery-operated devices. Whether for consumer electronics or in more specialized applications, the TPA0202 delivers reliable and impressive sound amplification, making it a go-to component for modern audio solutions.
Top Page Image Contents