50W Stereo Audio Power Amplifier based on TPA3116D2

I designed an audio power amplifier board based around the TPA3116D2. I choose the highest possible oscillator frequency of 1200khz. Many Chinese designs feature no output LC filter which may result in power losses and lower efficiency. Because of that, I choose higher grade components that are included in the output filter. My design also includes a large heatsink, which may come in handy when dealing with a version of the IC that has a bottom-mounted heat pad. My design also include loads of vias at the edge of the PCB which take care of high-frequency interference.

This amplifier is capable of delivering 50W to a single-channel load (4Ω).

TPA3116D2 Description

The TPA31xxD2 series are stereo efficient, digital amplifier power stage for driving speakers up to 100 W / 2 Ω in mono. The high efficiency of the TPA3130D2 allows it to do 2 × 15 W without external heat sink on a single layer PCB. The TPA3118D2 can even run 2 × 30 W / 8 Ω without heat sink on a dual layer PCB. If even higher power is needed the TPA3116D2 does 2 × 50 W / 4 Ω with a small heat-sink attached to its top side PowerPAD. All three devices share the same footprint enabling a single PCB to be used across different power levels.

The TPA31xxD2 advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences; this is achieved together with an option of either master or slave option, making it possible to synchronize multiple devices.

The TPA31xxD2 devices are fully protected against faults with short-circuit protection and thermal protection as well as overvoltage, undervoltage, and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.

Features

• Supports Multiple Output Configurations
  • 2 × 50 W Into a 4-Ω BTL Load at 21 V (TPA3116D2)
  • 2 × 30 W Into a 8-Ω BTL Load at 24 V (TPA3118D2)
  • 2 × 15 W Into a 8-Ω BTL Load at 15 V (TPA3130D2)
• Wide Voltage Range: 4.5 V to 26 V
• Efficient Class-D Operation
  • >90% Power Efficiency Combined With Low Idle Loss Greatly Reduces Heat Sink Size
  • Advanced Modulation Schemes
• Multiple Switching Frequencies
  • AM Avoidance
  • Master and Slave Synchronization
  • Up to 1.2-MHz Switching Frequency
• Feedback Power-Stage Architecture With High PSRR Reduces PSU Requirements
• Programmable Power Limit
• Differential and Single-Ended Inputs
• Stereo and Mono Mode With Single-Filter Mono Configuration
• Single Power Supply Reduces Component Count
• Integrated Self-Protection Circuits Including Overvoltage, Undervoltage, Overtemperature, DC-Detect, and Short Circuit With Error Reporting
• Thermally Enhanced Packages
  • DAD (32-Pin HTSSOP Pad Up)
  • DAP (32-Pin HTSSOP Pad Down)
• –40°C to 85°C Ambient Temperature Range

Schematic

Block Diagram

Photos

TPA3116D2 Datasheet

Please follow and like us: