The Texas Instruments TPA3128D2DAPR is a high-efficiency stereo Class-D audio power amplifier designed for Bluetooth speakers, wireless speakers, soundbars, televisions, docking systems and other compact audio products.
The TPA3128D2 supports a wide 4.5V to 26V supply-voltage range and can deliver 2 × 30W into 8Ω BTL loads at 24V. The device also supports Parallel BTL (PBTL) and mono-channel configurations, providing flexibility for stereo and higher-power mono audio designs.
High-efficiency Class-D architecture provides greater than 90% power efficiency under suitable operating conditions. Combined with low idle losses, this allows the amplifier to deliver 2 × 30W without requiring an external heat sink on a properly designed dual-layer PCB.
The amplifier features a very low idle current below 23mA with recommended LC-filter configurations. An adaptive modulation scheme dynamically adjusts operation according to output power, helping reduce idle losses and external LC-filter ripple in battery-powered audio systems.
TPA3128D2 provides selectable switching frequencies from 300kHz to 1.2MHz and incorporates AM-avoidance functionality. Master and slave synchronization is also supported, allowing multiple amplifier ICs to operate with synchronized switching frequencies in multi-channel systems.
A feedback power-stage architecture provides high power-supply rejection and can reduce power-supply filtering requirements. The device also includes programmable power limiting, giving designers control over maximum speaker output power.
Integrated protection features include short-circuit protection, overtemperature protection, overvoltage protection, undervoltage protection and DC-detection protection. Fault conditions can be reported back to the system processor through the FAULT output.
The TPA3128D2DAPR uses a thermally enhanced 32-pin HTSSOP PowerPAD-down (DAP) package with a nominal body size of approximately 11.0 × 6.2mm. The R suffix indicates large tape-and-reel packaging suitable for automated SMT assembly.
Key Features
- Manufacturer: Texas Instruments / TI
- Part Number: TPA3128D2DAPR
- Product Type: Audio Power Amplifier
- Amplifier Architecture: Class-D
- Audio Input Type: Analog
- Speaker Channels: Stereo
- Stereo Output Power: 2 × 30W
- Stereo Load: 8Ω @ 24V
- Mono / PBTL Operation: Supported
- Supply Voltage Range: 4.5V to 26V
- Minimum Supported Load: 2Ω
- Power-Stage RDS(on): 0.09Ω
- Power Efficiency: >90% under suitable conditions
- Idle Current: <23mA with recommended LC filter
- Switching Frequency: 300kHz to 1.2MHz
- AM Avoidance: Supported
- Master / Slave Synchronization: Supported
- Programmable Power Limit
- Adaptive Modulation
- High-PSRR Feedback Power Stage
- Single-Supply Operation: Supported
- Dual-Supply Operation: Supported
- Short-Circuit Protection
- Overtemperature Protection
- Overvoltage Protection
- Undervoltage Protection
- DC-Detection Protection
- Fault Reporting
- Operating Temperature: -40°C to +85°C
- Package: HTSSOP-32 PowerPAD
- Package Code: DAP
- Package Body Size: Approx. 11.0 × 6.2mm
- Mounting Type: Surface Mount
- Packaging: Large Tape & Reel
- Standard Reel Quantity: 2,000 pcs
- RoHS Compliant
- REACH Compliant
- Product Status: Active
Typical Applications
- Bluetooth Speakers
- Wireless Speakers
- Soundbars
- Portable Speaker Systems
- LCD / LED TVs
- Home Theater Systems
- Audio Docking Stations
- Multimedia Speakers
- Consumer Audio Equipment
- Battery-Powered Audio Systems
- Embedded Audio Systems
- Stereo and Mono Audio Amplifiers
The TPA3128D2DAPR is suitable for audio designs requiring a compact 2 × 30W Class-D amplifier with wide 4.5V–26V supply operation, high efficiency, low idle losses and integrated fault protection.
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