Item specifics
Description
The TPA3116D2DADR is a Class-D stereo/mono audio power amplifier from Texas Instruments in a HTSSOP-32 (DAD, PowerPAD-up) package. It delivers 2×50W stereo into 4Ω BTL loads at 21V, or 100W mono into 2Ω in bridge-tied mode. The wide 4.5V to 26V supply range, >90% power efficiency, and low idle loss drastically reduce heatsink requirements. The device supports a filter-free architecture, AM interference avoidance, master/slave synchronization (up to 1.2MHz switching), and programmable power limiting, with integrated overvoltage, undervoltage, overtemperature, DC-detect, and short-circuit protection plus SpeakerGuard™. As the highest-power member of the pin-compatible TPA31xxD2 family (alongside TPA3118D2 and TPA3130D2), it enables one PCB to span multiple power tiers. Typical applications include Bluetooth speakers, soundbars, automotive audio, desktop Hi-Fi, and 2.1 subwoofer systems.
| Model | TPA3116D2DADR |
| Device Type | Class-D Audio Power Amplifier |
| Output Configuration | Stereo (2×BTL) / Mono (PBTL) |
| Supply Voltage Range | 4.5 V ~ 26 V |
| Output Power (Stereo) | 2 × 50 W @ 21V, 4Ω BTL |
| Output Power (Mono) | 100 W @ 2Ω BTL |
| Efficiency (Typical) | > 90% |
| THD+N (Typical) | 0.1% |
| SNR | 102 dB |
| PSRR | -70 dB |
| Quiescent Current (Iq) | 20 mA (Typical) |
| Switching Frequency | Up to 1.2 MHz (Programmable, Multiple Options) |
| Architecture | Filter-Free Class-D |
| Input Type | Differential / Single-Ended Analog |
| Protections | SpeakerGuard™: OV, UV, OT, DC Detect, Short Circuit, with Error Reporting |
| Special Features | AM Avoidance, Master-Slave Sync, Programmable Power Limit |
| Package | HTSSOP-32 (DAD, with Exposed PowerPAD) |
| Operating Temp (TA) | -40℃ ~ +85℃ |
| MSL | Level-3-260C-168 HR |
TPA3116D2DADR Typical Applications
TVs, soundbars, and home theater systems
Portable Bluetooth speakers and DIY high-power amplifier boards
Automotive audio upgrades and aftermarket systems
Active speakers and powered monitors
Professional audio and public address systems
FAQ
Q: Does the TPA3116D2DADR require an external LC filter?
A: No. The chip uses a filter-free architecture and can directly drive speakers. However, for strict EMI compliance (e.g., CE/FCC), reserving LC filter pads and populating based on radiated emissions testing is recommended.
Q: How is 2×50W achieved, and what thermal precautions are needed?
A: 2×50W is measured at 21V into a 4Ω BTL load. With over 90% efficiency, most power is delivered, but several watts are dissipated. The PowerPAD must be soldered to sufficient PCB copper with a via array to conduct heat to the backside or a heatsink. For sustained full-power 4Ω operation, a small heatsink attached to the top-side PowerPAD is recommended.
Q: What are the differences between TPA3116D2, TPA3118D2, and TPA3130D2?
A: They share the same footprint and belong to the TPA31xxD2 family, differing in output power capability: TPA3116D2 (2×50W@4Ω/21V), TPA3118D2 (2×30W@8Ω/24V), and TPA3130D2 (2×15W@8Ω/15V). A single PCB can be configured for different power levels, simplifying inventory management.
Q: What does SpeakerGuard™ protection include?
A: Overvoltage, undervoltage, overtemperature, DC detection (preventing DC offset from damaging speakers), and short-circuit protection, with fault reporting via the FAULT pin for system monitoring.
Q: How is the switching frequency set to avoid AM interference?
A: The TPA3116D2 offers multiple switching frequency options (up to 1.2MHz), settable via external resistor or configuration pin. Choose a frequency away from sensitive AM bands based on system clocks, and use master-slave synchronization for multi-chip coordination.
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