Overview
The TPA3121D2PWPR from Texas Instruments is a highly efficient, 15-W (per channel) class-D audio power amplifier designed for driving stereo speakers in various applications. This amplifier operates from a supply voltage range of 10 V to 26 V, making it versatile for different power sources. It is particularly suited for use in flat panel display TVs, DLP TVs, CRT TVs, and powered speakers. The TPA3121D2PWPR features advanced power-off pop reduction and thermal protection, ensuring reliable operation without the need for external heat sinks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 10 | 26 | V | |
| Output Power (per channel) at 1% THD+N | 15 | W (into 4 Ω load from 22 V supply) | ||
| Output Power (mono) at 1% THD+N | 30 | W (into 8 Ω load from 22 V supply) | ||
| Gain Settings | 20 | 26, 32, 36 | dB | |
| Operating Free-Air Temperature | -40 | 85 | °C | |
| Thermal Trip Point | 150 | °C | ||
| Oscillator Frequency | 250 | 300 | 350 | kHz |
| Quiescent Supply Current (no load) | 16 | 30 | mA | |
| Total Harmonic Distortion + Noise (THD+N) at 1 kHz | 0.01 | 0.04 | % |
Key Features
- Efficient class-D operation eliminates the need for external heat sinks.
- Four selectable, fixed-gain settings (20, 26, 32, and 36 dB) controlled by two gain select pins.
- Internal oscillator to set class-D frequency without external components.
- Single-ended analog inputs.
- Thermal and short-circuit protection with auto recovery.
- Advanced power-off pop reduction.
- Space-saving surface mount 24-pin TSSOP package.
- Good power supply rejection due to closed-loop architecture.
Applications
- Flat panel display TVs.
- DLP TVs.
- CRT TVs.
- Powered speakers.
- Other audio systems requiring efficient and compact amplification.
Q & A
- What is the operating voltage range of the TPA3121D2PWPR?
The TPA3121D2PWPR operates from a supply voltage range of 10 V to 26 V.
- What are the output power capabilities of the TPA3121D2PWPR?
The amplifier can deliver 15 W per channel into a 4 Ω load from a 22 V supply and 30 W in mono configuration into an 8 Ω load from a 22 V supply.
- What are the gain settings available on the TPA3121D2PWPR?
The gain can be set to 20, 26, 32, or 36 dB using two gain select pins.
- Does the TPA3121D2PWPR require an external heat sink?
No, the efficient class-D operation of the TPA3121D2PWPR eliminates the need for an external heat sink.
- What kind of thermal protection does the TPA3121D2PWPR have?
The device has thermal protection that shuts down the outputs if the internal die temperature exceeds 150°C and resumes operation once the temperature drops by 30°C.
- How is the oscillator frequency set on the TPA3121D2PWPR?
The oscillator frequency is set internally without the need for external components.
- What type of package does the TPA3121D2PWPR come in?
The TPA3121D2PWPR comes in a space-saving surface mount 24-pin TSSOP package.
- What is the typical quiescent supply current of the TPA3121D2PWPR?
The typical quiescent supply current is 16 mA to 30 mA depending on the mode (mute or shutdown).
- What is the total harmonic distortion + noise (THD+N) of the TPA3121D2PWPR at 1 kHz?
The THD+N at 1 kHz is typically 0.01% to 0.04%.
- How does the TPA3121D2PWPR handle power supply rejection?
The device has good power supply rejection due to its closed-loop architecture, and performance can be further improved by adding a filter between the PVCC and AVCC supplies.
