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Texas Instruments TAS2781 Class-D Amplifier

Texas Instruments TAS2781 Class-D Amplifier is optimized with real-time integrated speaker protection and audio processing. The TAS2781 delivers 25W of continuous power into a 4Ω load with less than 1% THD+N at a supply voltage of 18V. The device’s broad voltage input range and high output power are ideal for battery or line-powered systems.

The TI TAS2781 Class-D amplifier’s on-chip DSP supports the Texas Instruments Smart Amp speaker protection algorithm. The integrated speaker voltage and current sense equip for real-time monitoring of loudspeakers. Y-Bridge power architecture improves amplifier efficiency by internally selecting the supplies for optimal headroom. A brownout prevention scheme with an adjustable threshold reduces the signal path gain when the supply drops.

The Hybrid-Pro algorithm enables the user to optimize efficiency and improve battery life by controlling the external power supply. Up to eight TAS2781 devices can share a common bus through I²S/TDM and I²C/SPI interfaces.

The TAS2781 is housed in a 30-pin HR-QFN package for a compact PCB footprint.

Features

Key features
- Integrated DSP for audio processing
- 23V Supply for the class-D output stage
- Y-Bridge multi-level supply architecture
- Hybrid-pro external boost control algorithm
- Ultrasonic output support up to 40kHz
Efficiency (1% THDN) and power consumption
- 82% at 1W, 4Ω, PVDDH = 12V, PVDDL = 3.8V
- 83% at 1W, 8Ω, PVDDH = 18V, PVDDL = 5V
- 84% at 1W, 4Ω, PVDDH = 18V, PVDDL = 5V
- 90% at 15W, 4Ω, PVDDH = 18V, PVDDL = 5V
- 93% at 15W , 8Ω, PVDDH = 18V, PVDDL = 5V
- <0.5μA in Hardware shutdown mode
Power supplies and management:
- 1.8V AVDD
- 1.8V/3.3V IOVDD
- 2.7V to 5.5V PVDDL
- 4.5V to 23V PVDDH
Output power:
- 25W, 1% THD+N (4Ω, 18V)
- 30W Maximum output power, 10% THD+N

Interfaces and control:
- SDOUT for Echo cancellation
- I²S/TDM 8x Channels of 32-bits up to 192KSPS
- I²C with Fast Mode+ or SPI interface
- Inter-chip communication bus
- 16kHz to 192kHz Sample rates
Advanced DSP audio processing:
- Real-time IV-sense for speaker protection
- Dynamic range compressor
- Brownout protection with power limiter
- Multi-channel balancing communication
Protection and EMI:
- Overpower and low battery protection
- PVDDH/ PVDDL Supply tracking limiters
- Thermal and over-current protections
- Thermal foldback
- Post filter feedback and slew rate control

Applications

Laptop and desktop computers
Smart speakers

Tablets and handhelds
Wireless speakers

Texas Instruments TAS2781 Class-D Amplifier

Features

Applications

Schematic

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