Overview
The TPA711 is a bridge-tied load (BTL) or single-ended (SE) audio power amplifier developed by Texas Instruments. It is designed for low-voltage applications, particularly where internal speakers and external earphone operation are required. The amplifier operates efficiently with 3.3-V and 5-V supplies, making it suitable for battery-powered equipment. It can deliver up to 250 mW of continuous power into an 8-Ω load in BTL mode at 3.3 V and up to 700 mW at 5 V, with a total harmonic distortion plus noise (THD+N) of less than 0.6% throughout voice band frequencies. The TPA711 features a unique mode-switching capability between BTL and SE, eliminating the need for mechanical switching or auxiliary devices.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Supply Voltage Range | 2.5 V to 5.5 V | V | |
| Output Power (BTL, 3.3 V, 8 Ω) | 250 mW | mW | VDD = 3.3 V, RL = 8 Ω |
| Output Power (BTL, 5 V, 8 Ω) | 700 mW | mW | VDD = 5 V, RL = 8 Ω |
| Output Power (SE, 3.3 V, 32 Ω) | 37 mW | mW | VDD = 3.3 V, RL = 32 Ω |
| Output Power (SE, 5 V, 32 Ω) | 85 mW | mW | VDD = 5 V, RL = 32 Ω |
| Shutdown Current (3.3 V) | 7 µA | µA | SHUTDOWN = VDD |
| Shutdown Current (5 V) | 50 µA | µA | SHUTDOWN = VDD |
| Operating Temperature Range | -40°C to 85°C | °C | |
| Package Types | SOIC, PowerPAD MSOP |
Key Features
- Fully specified for 3.3-V and 5-V operation with wide power supply compatibility (2.5 V to 5.5 V).
- High output power: up to 700 mW at 5 V and 250 mW at 3.3 V in BTL mode.
- Dynamic mode switching between BTL and SE without mechanical switching or auxiliary devices.
- Shutdown mode with low current consumption (7 µA at 3.3 V and 50 µA at 5 V).
- Integrated depop circuitry to eliminate speaker noise when exiting shutdown mode.
- Thermal and short-circuit protection.
- Surface-mount packaging options: SOIC and PowerPAD MSOP, reducing board space and height.
Applications
- Wireless communications devices, such as mobile phones and two-way radios, where narrow band audio is required.
- Battery-powered audio equipment, including portable speakers and headphones.
- Internal speakers and external earphone applications in various electronic devices.
- Low-voltage audio amplification in consumer electronics and industrial devices.
Q & A
- What is the TPA711 audio amplifier designed for?
The TPA711 is designed for low-voltage applications, particularly where internal speakers and external earphone operation are required.
- What are the operating voltage ranges for the TPA711?
The TPA711 operates within a voltage range of 2.5 V to 5.5 V.
- What is the maximum output power of the TPA711 in BTL mode at 3.3 V and 5 V?
The maximum output power is 250 mW at 3.3 V and 700 mW at 5 V in BTL mode.
- How does the TPA711 switch between BTL and SE modes?
The TPA711 can switch between BTL and SE modes dynamically without the need for mechanical switching or auxiliary devices.
- What is the shutdown current consumption of the TPA711 at 3.3 V and 5 V?
The shutdown current is 7 µA at 3.3 V and 50 µA at 5 V.
- What types of packaging are available for the TPA711?
The TPA711 is available in SOIC and PowerPAD MSOP packages.
- What kind of protection does the TPA711 have?
The TPA711 features thermal and short-circuit protection.
- What is the significance of the integrated depop circuitry in the TPA711?
The integrated depop circuitry eliminates speaker noise when exiting shutdown mode.
- What are some typical applications of the TPA711?
Typical applications include wireless communications devices, battery-powered audio equipment, and internal speakers and external earphone applications.
- What is the operating temperature range of the TPA711?
The operating temperature range is -40°C to 85°C.
