TPA005D12 Class-D EVM Performance Characteristics

3.6 TPA005D12 Class-D EVM Performance Characteristics

The TPA005D12 class-D stereo audio power amplifier EVM was tested using an Audio Precision System II, model 2322, a 5-V regulated dc power supply, and the TI PNP audio power amplifier evaluation platform set up as described in Chapter 2. Results were obtained with 4-Ωand 8-Ωspeaker loads. The results are shown in Figures 3±11 through 3±17.

The frequency response shown in Figure 3±17 is a relatively flat 20 dB over the 20 Hz to 100 kHz frequency range. The lower and upper frequency corners can be adjusted to extend the frequency response.

Figure 3±11. Class-D Amplifier Frequency Response at 4 Ω

VOLTAGE AMPLIFICATION

 

 

 

vs

 

 

 

22.5

 

FREQUENCY

 

 

 

 

 

 

 

 

20

 

 

 

 

dB

17.5

 

 

 

 

15

 

 

 

 

±

 

 

 

 

 

 

 

 

 

Amplification

12.5

 

 

 

 

10

 

 

 

 

7.5

 

 

 

 

Voltage

5

 

 

 

 

2.5

 

 

 

 

 

 

 

 

 

 

0

VDD = 5 V

 

 

 

 

±2.5

RL = 4 Ω

 

 

 

 

TA = 25° C

 

 

 

 

±5

 

 

 

 

 

10

100

1k

10k

100k

 

 

 

f ± Frequency ± Hz

 

 

Total harmonic distortion plus noise (THD+N) versus output power and frequency is shown in Figures 3±12 through 3±15 below. Figures 3±12 and 3±13 show power sweeps at a fixed frequency of 1 kHz. Switching and input noise begins to dominate at low power, while the distortion at the mid to upper power levels is a function of the class-D amplifier and the inductor. The lower frequency noise may be improved by either increasing the order of the filter or by increasing the amplifier switching frequency, which will further attenuate the switching noise in the audio band.

Midrange distortion is a combination of the switching noise of the output power transistors in the IC and the magnetic field created by the inductors. This distortion is minimized by good separation of the output filter inductors for each channel and through good EMI-reduction layout techniques.

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Details

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Texas Instruments TPA005D12 Class-D EVM Performance Characteristics, ±11. Class-D Amplifier Frequency Response at 4 Ω
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TPA005D12 specifications

The Texas Instruments TPA005D12 is a highly regarded digital audio power amplifier that is engineered for high-performance applications. It is part of TI's TPA series, which is known for its efficient power delivery and superior sound quality. The TPA005D12 is designed to drive passive speakers while ensuring minimal power loss and efficient heat management.

One of the standout features of the TPA005D12 is its ability to provide 5 watts of continuous output power per channel into an 8-ohm load with a low total harmonic distortion (THD) rating. This makes it suitable for use in a variety of audio applications, including computer speakers, soundbars, and portable audio systems. The amplifier operates from a single supply voltage, ranging typically from 4.5V to 14V, allowing for flexible integration into different power supply environments.

The TPA005D12 adopts Class-D amplification technology, which significantly enhances power efficiency compared to traditional linear amplifiers. Class-D amplifiers convert the input audio signal into a series of pulse-width modulated signals, resulting in increased power savings and reduced heat generation. This not only improves the overall energy efficiency but also contributes to a longer operational lifespan for devices utilizing this technology.

Additionally, the TPA005D12 features an integrated thermal and short-circuit protection mechanism, which helps safeguard the amplifier from potential damage due to excessive temperatures or electrical faults. This reliability factor is crucial for manufacturers looking to create robust consumer electronics.

Another important characteristic is its integrated low-noise power supply rejection ratio (PSRR), which helps maintain sound clarity and reduces the impact of power supply noise on audio quality. The TPA005D12 also supports differential input signals, which can improve common-mode noise rejection and further enhance audio performance.

The device is offered in a compact package suitable for space-constrained applications, enabling easy integration into various designs. With a combination of low cost, high efficiency, and excellent audio performance, the Texas Instruments TPA005D12 stands out as a top choice for developers and engineers seeking reliable audio amplification solutions. Whether in home entertainment systems or personal audio devices, the TPA005D12 is designed to deliver exceptional sound quality with a minimal footprint.
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