Audio amplifier design technology TPA31xxD2 main features

TI's TPA31xxD2 series is a stereo high-efficiency digital power amplifier capable of driving 2 ohm speakers up to 100W. Operating voltage 4.5 V – 26 V, efficiency greater than 90%. The high efficiency of the TPA3130D2 can be achieved with a single-layer PCB, providing 2x15W output power without a heat sink. TPA3118D2 uses double-layer PCB, no heat sink provides 2x30W/8 ohm output power, TPA3116D2 uses small heatsink to provide 2x50W/4Ω output power, mainly used for small/micro component strip speakers, aftermarket automotive electronics, CRT TV And consumer audio. This article describes the main features of TPA31xxD2, block diagram, application circuit diagram and evaluation board TPA3116D2EVM main indicators, circuit diagram, bill of materials and PCB layout.

The TPA3xxD2 series are stereo efficient, digital amplifier power stage for driving speakers up to 100W/2Ω in mono. The high efficiency of the TPA3130D2 allows it to do 2x15W without external heat sink on a single layer PCB. The TPA3118D2 can even run 2x30W/ 8Ω without heat sink on a dual layer PCB. If even higher power is needed the TPA3116D2 does 2x50W/4Ω 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 Master/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 over-voltage, under-voltage and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.

Main features of TPA31xxD2:

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 – 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/Slave Synchronization

Up to 1.2 MHz Switching Frequency

Feedback Power Stage Architecture with High PSRR Reduces PSU Requirements

Programmable Power Limit

Differential/Single-Ended Inputs

Stereo and Mono Mode with Single Filter Mono Configuration

Single Power Supply Reduces Component Count

Integrated Self-Protection Circuits Including

Over-Voltage, Under-Voltage, Over-Temperature, 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

TPA31xxD2 application:

Mini-Micro Component, Speaker Bar, Docks

After-Market Automotive

CRT TV

Consumer Audio Applications

Figure 1. Block diagram of the TPA31xxD2 series

Figure 2. SPA31xxD2 Series Simplified Application Circuit Diagram

Figure 3. TPA31xxD2 Series Application Circuit Diagram

Evaluation Board TPA3116D2EVM

The TPA3116D2EVM evaluation module (EVM) demonstrates the integrated circuits TPA3116D2 from Texas Instruments (TI).

The TPA3116D2 is a 50-W (per channel), efficient, stereo, digital-amplifier power stage for driving two bridge-tied speakers or a single parallel bridge-tied load. The TPA3116D2 can drive a speaker with an impedance as low as 3.2 Ω (4 Ω typical).

The TPA3116D2 is available in a 32-pin TSSOP.

The TPA3116D2 evaluation module consists of a single 50-W, Class-D, stereo audio power amplifier complete with a small number of external components mounted on a circuit board that can be used to directly drive a speaker with an external analog audio source as the The EVM's default output filter configuration supports LC filter operation, but can easily be configured to support filter-free operation or micro inductors. The EVM can also be configured as a 100-W, Class-D mono audio power amplifier.

Designers can quickly evaluate the sound quality and verify specifications in their application with the TPA3116D2EVM. In addition, the TPA3116D2EVM User's Guide contains the schematic, layout and bill of materials for a reference design.

Evaluation Board TPA3116D2EVM Main Indicators:

Figure 4. Outline of the evaluation board TPA3116D2EVM

Figure 5. Evaluation board TPA3116D2EVM circuit diagram

Evaluation Board TPA3116D2EVM Bill of Materials:

Figure 6. Evaluation Board TPA3116D2EVM PCB Layout

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