Overview
The TPA3126D2DADR is a 50-W, stereo, low-idle-current Class-D audio amplifier manufactured by Texas Instruments. This device is designed to extend the battery life of portable audio systems, such as Bluetooth speakers, through its proprietary hybrid modulation scheme. The amplifier operates in a thermally enhanced 32-pin HTSSOP PowerPAD™ package, ensuring efficient heat dissipation and high performance. It is a performance upgrade of the TPA3116D2, offering 70% less idle current and maintaining pin-to-pin compatibility.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTSSOP (32-pin) | - |
| Operating Temperature Range | -40 to 85 | °C |
| Continuous Output Power | 50 W | - |
| Load Resistance | 4 Ω | - |
| Supply Voltage Range | 4.5 V to 26 V | V |
| Idle Current | 15 mA at 12 V | mA |
| Switching Frequencies | 300 kHz to 1.2 MHz | kHz |
| Selectable Gains | 20 dB, 26 dB, 32 dB, 36 dB | dB |
| Thermal Resistance (Junction-to-Ambient) | 1.2 °C/W | °C/W |
Key Features
- Ultra-low idle current of 15 mA at 12 V, extending battery life in portable audio systems.
- Highly efficient Class-D operation with a low Rds(on) of 90 mΩ, enabling > 90% efficiency.
- Hybrid modulation scheme dynamically reduces power loss and idle current at low power levels.
- Pop-and-click noise suppression for improved audio quality.
- Supports stereo, mono BTL, and mono PBTL configurations.
- Multiple switching frequencies with AM avoidance and master/slave synchronization.
- Programmable power limit and selectable gains (20 dB, 26 dB, 32 dB, 36 dB).
- Integrated protections with error report for overvoltage, undervoltage, overtemperature, DC-detect, and short circuit.
- Thermally enhanced package with PowerPAD™ for efficient heat dissipation.
Applications
- Speaker docks
- Bluetooth and Wi-Fi speakers
- Voice-operated speakers or smart speakers
- Sound bars
- Bookshelf stereo systems
Q & A
- What is the maximum output power of the TPA3126D2DADR?
The TPA3126D2DADR can deliver up to 50 W of continuous output power into a 4-Ω load at 21 V with 10% THD+N.
- What is the operating temperature range of the TPA3126D2DADR?
The operating temperature range is -40°C to 85°C).
- What are the selectable gains available on the TPA3126D2DADR?
The device offers selectable gains of 20 dB, 26 dB, 32 dB, and 36 dB).
- Does the TPA3126D2DADR support both single and dual power supply configurations?
- What types of audio configurations does the TPA3126D2DADR support?
- How does the hybrid modulation scheme benefit the TPA3126D2DADR?
The hybrid modulation scheme dynamically reduces idle current at low power levels, extending battery life in portable audio systems).
- What are the integrated protection features of the TPA3126D2DADR?
- Can the TPA3126D2DADR be synchronized with other Class-D devices?
- What is the typical idle current of the TPA3126D2DADR at 12 V?
- Is the TPA3126D2DADR pin-to-pin compatible with the TPA3116D2?
