TAS2781 Speaker-Protection Class D Amp

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            TAS2781 Speaker-Protection Class D Amp
                    Texas Instruments' mono digital input amp features real-time integrated speaker protection and audio processing
    

Texas Instruments' TAS2781 is a mono digital input Class D audio amp that is optimized for efficiently driving high peak power into loudspeakers. The Class D amp can deliver 25 W of continuous power into a 4 Ω load with less than 1% THD+N at a supply voltage of 18 V. The broad voltage input range and the high output power make this amp suitable for battery or line-powered systems. An on-chip DSP supports Texas Instruments' smart amp speaker-protection algorithm.

The integrated speaker voltage and current sense enable real-time monitoring of loudspeakers. The Y-bridge power architecture improves the amp efficiency by internally selecting the supplies for optimal headroom. The brownout prevention scheme with an adjustable threshold allows for gain reduction in a signal path when the supply drops. The hybrid-pro algorithm allows the user to optimize the efficiency and improve the battery life by controlling the external power supply. Up to eight TAS2781 devices can share a common bus via the I²S/TDM and I²C/SPI interfaces. The TAS2781 is available in a 30-pin HR-QFN package for a compact PCB footprint.

Features

Integrated DSP for audio processing
Supply: 23 V for Class D output stages
Y-bridge multi-level supply architecture
Ultrasonic output support: up to 40 kHz
Output power:
- 25 W and 1% THD+N (4 Ω, 18 V)
- 30 W (max.) and 10% THD+N
Efficiency (1% THD+N) and power consumption:
- 82% at 1 W, 4 Ω, PVDDH = 12 V, and PVDDL = 3.8 V
- 83% at 1 W, 8 Ω, PVDDH = 18 V, and PVDDL =5 V
- 84% at 1 W, 4 Ω, PVDDH = 18 V, and PVDDL = 5 V
- 90% at 15 W, 4 Ω, PVDDH = 18 V, and PVDDL = 5 V
- 93% at 15 W, 8 Ω, PVDDH = 18 V, and PVDDL = 5 V
- <0.5 μA in hardware shutdown mode
Power supplies and management:
- AVDD: 1.8 V
- IOVDD: 1.8 V and 3.3 V
- PVDDL: 2.7 V to 5.5 V
- PVDDH: 4.5 V to 23 V

Hybrid-pro external boost control algorithm
Interfaces and control:
- SDOUT for echo cancellation
- I²S/TDM: 8 channels of 32 bits to 192 KSPS
- I²C with fast mode+ or an SPI interface
- Inter-chip communication bus
- Sample rate range: 16 kHz to 192 kHz
Advanced DSP audio processing:
- Real-time IV-sense for speaker protection
- Dynamic range compressor
- Brownout protection with a power limiter
- Multi-channel balancing communication
- Protection and EMI:
  - Overpower and low-battery protection
  - PVDDH/PVDDL supply tracking limiters
  - Thermal and overcurrent protections
  - Thermal foldback
  - Post-filter feedback and slew-rate control

Applications

Laptops and desktop computers
Smart speakers

Tablets and handhelds
Wireless speakers