TITPA3132D225WClassD Stereo Power Amplifier Reference Design

TI’s TPA3132D2 is a stereo digital power amplifier that effectively drives up to 2*42W/4Ω speakers. When the TPA3132D2 chip drives 2*25W/8Ω, it does not need to use a heat sink, and can dissipate heat through the power pad at the bottom of the PCB board. The TPA3132D2 chip has short circuit protection, overheat protection, overvoltage protection, undervoltage protection, etc. In the event of an overload fault, the protection device will provide feedback to the processor. This article first introduces the chip’s brief introduction, characteristics, internal block diagram and application fields, and gives the design schematic diagram, component list and PCB component layout diagram of the corresponding design scheme.

The TPA3131/32D2 are efficient, stereo digital amplifier power stages for driving speakers with up to 2x42W/4Ω operating peak power. TPA3131/32D2 heatsink-free with cooling to PCB through the bottom side Power-Pad with sustained output power from 2x4W/8Ω (TPA3131D2) to 2x25W/8Ω (TPA3132D2).

The TPA3131/32D2 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 TPA3131/32D2 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.

For feature compatible devices see: Power Pad up device 2x50W TPA3116D2, Power Pad down 2x15W TPA3130D2 and 2x30W TPA3118D2.

Main features of TPA3132D2:

Supports Multiple Output Configurations
2×4-W into a 8-Ω BTL Load at 7.4 V (TPA3131D2)
2×25-W into a 8-Ω BTL Load at 19 V (TPA3132D2)
Wide Voltage Range: 4.5V – 26V
Automotive Load-Dump Compliant
Efficient Class-D Operation
>90% Power Efficiency Combined with Low Idle Loss for Heat Sink free Operation
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 Package
32-Pin QFN Pad-Down
–40℃ to 85℃ Ambient Temperature Range

TPA3132D2 application:

Laptop Computers and Ultrabooks
Flatpanel TV
Consumer Audio Applications