Overview
The TPA3122D2 from Texas Instruments is a high-performance, 15-W (per channel) Class-D audio power amplifier designed for driving stereo speakers or mono bridge-tied loads. This amplifier operates efficiently, eliminating the need for an external heat sink during music playback. It supports a wide supply voltage range from 10 V to 30 V and can drive speakers as low as 4Ω. The TPA3122D2 features four selectable, fixed gain settings controlled by two gain select pins, providing flexibility in various audio applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 10 to 30 | V |
| Output Power (per channel) into 4Ω Load | 10 W | W |
| Output Power (per channel) into 8Ω Load | 15 W | W |
| Gain Settings | 20, 26, 32, 36 dB | dB |
| Operating Free-Air Temperature Range | -40 to 85 | °C |
| Operating Junction Temperature Range | -40 to 150 | °C |
| Quiescent Supply Current (No Load) | 23 to 37 mA | mA |
| Total Harmonic Distortion + Noise (THD+N) at 1 kHz, 1 W into 8Ω | 0.06% | % |
| Signal-to-Noise Ratio (SNR) | 99 dB | dB |
| Package Type | 20-pin DIP |
Key Features
- Efficient Class-D Operation: Reduces the need for an external heat sink during music playback.
- Four Selectable Gain Settings: 20, 26, 32, and 36 dB, controlled by two gain select pins.
- Internal Oscillator: No external components required.
- Single-Ended Analog Inputs: Supports single-ended configurations.
- Thermal and Short-Circuit Protection with Auto Recovery: Ensures robust operation and automatic recovery from faults.
- Bootstrap I/O for Each Channel: Enhances performance in bridge-tied load (BTL) configurations.
- Adequate Power Supply Decoupling: Required for optimal performance and to prevent oscillations.
Applications
- Home Audio Systems: Suitable for stereo speakers and home audio setups.
- Automotive Audio Systems: Can be used in car audio systems due to its robust and efficient design.
- Consumer Electronics: Ideal for televisions, soundbars, and other consumer audio devices.
- Professional Audio Equipment: Can be integrated into professional audio systems requiring efficient and reliable amplification.
Q & A
- What is the maximum output power of the TPA3122D2 per channel into an 8Ω load?
The maximum output power is 15 W per channel into an 8Ω load from a 28-V supply.
- What are the available gain settings for the TPA3122D2?
The gain settings are 20, 26, 32, and 36 dB, controlled by two gain select pins.
- What is the operating supply voltage range for the TPA3122D2?
The operating supply voltage range is from 10 V to 30 V.
- Does the TPA3122D2 require an external heat sink?
No, the efficient Class-D operation eliminates the need for an external heat sink during music playback.
- What type of protection does the TPA3122D2 have?
The TPA3122D2 has thermal and short-circuit protection with auto recovery feature.
- What is the package type of the TPA3122D2?
The package type is a 20-pin DIP.
- Can the TPA3122D2 be used in bridge-tied load (BTL) configurations?
- What is the signal-to-noise ratio (SNR) of the TPA3122D2?
The SNR is 99 dB.
- How does the TPA3122D2 handle power supply decoupling?
Adequate power supply decoupling is required using two capacitors of different types to target different types of noise on the power supply leads.
- What is the typical quiescent supply current of the TPA3122D2?
The typical quiescent supply current is 23 to 37 mA.
