Using the TPA102 MSOP EVM With the Plug-N-Play Evaluation Platform

3.3.3Shutdown

The TPA102 MSOP EVM is equipped with a shutdown control input pin. When this input is tied to VDD, the TPA102 amplifier IC on the module ceases operation and enters an ultralow-power state. When the EVM shutdown 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 muted to conserve power.

3.3.3.1Headphone 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 or removed (Figure 3 –6). Each control line is pulled down by a 1-kresistor to ground (R4 and R5). The switch in the headphone jack pulls one line or the other up to VDD through a 240-resistor (R3), depending on whether or not a plug is inserted in J10.

Figure 3–6. Shutdown Polarity Control

VDD

 

 

 

 

R3

 

Polarity

 

 

240

 

 

 

 

JP7

 

 

 

 

 

 

J10

 

Lo

Shutdown

U5

 

 

Headphone

 

 

Headphone

 

 

 

Jack

 

Hi

 

Amplifier

R4

R5

 

 

HP

 

 

1 k

1 k

(U5)

 

 

3.3.3.2Shutdown Polarity Select (JP7)

A 3-pin jumper header (JP7) on the platform selects the shutdown control signal polarity by connecting either the active-high or the active-low line from the headphone jack to platform socket U5. The TPA102 MSOP EVM shuts downJwhen VDD is applied to the module SD pin.

To shutdown the TPA102 MSOP amplifier module when a plug is

Jinserted into the headphone jack, jumper JP7 to Hi.

To shutdown the TPA102 MSOP amplifier module until a plug is inserted into the headphone jack, jumper JP7 to Lo (this is the typical setting).

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Details

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Texas Instruments TPA102 MSOP manual Shutdown Polarity Control

TPA102 MSOP specifications

The Texas Instruments TPA102 is a highly efficient class-D audio amplifier designed specifically for portable applications, making it an ideal choice for devices like smartphones, tablets, and other battery-operated electronics. One of its standout features is its ability to deliver powerful output while maintaining a small footprint, thanks to its MSOP (Micro Small Outline Package) design. This compact packaging allows designers to implement the TPA102 in space-constrained environments without sacrificing performance.

A key characteristic of the TPA102 is its efficient power consumption. The amplifier is capable of delivering substantial output power with minimal distortion, which is critical for ensuring high-quality audio playback. It supports a wide range of supply voltages, typically from 2.5V to 5.5V, making it versatile for various applications. With a typical output power of 1W into an 8-ohm load, the TPA102 excels in delivering clean audio signal without considerable heat generation, which is particularly beneficial in battery-powered devices where thermal management can be a challenge.

The TPA102 incorporates several innovative technologies that contribute to its performance. One such technology is the elimination of output filter components, which simplifies the design and reduces the overall cost. Additionally, the device features integrated protection mechanisms that prevent overheating and short-circuiting, thereby enhancing reliability. This combination of efficiency and durability makes the TPA102 suitable for rugged and demanding audio applications.

Another impressive aspect of the TPA102 is its low total harmonic distortion (THD), which ensures that the audio signal remains clear and true to the original input. Coupled with an excellent signal-to-noise ratio, the TPA102 is designed to provide an immersive listening experience in various audio setups.

Moreover, the TPA102 supports multiple operating modes, including shutdown mode that significantly reduces power consumption when the device is not in use. This feature is especially beneficial in portable applications where battery life is a crucial consideration.

In summary, the Texas Instruments TPA102 MSOP audio amplifier stands out for its compact size, efficient power consumption, and high-quality audio output. With advanced features and robust protection mechanisms, it is a reliable choice for designers seeking to develop cutting-edge audio solutions in portable devices.