Overview
The LM2876TF/NOPB is a high-performance audio power amplifier from Texas Instruments, part of the Overture™ Audio Power Amplifier Series. This device is capable of delivering 40W of continuous average power to an 8Ω load with a total harmonic distortion plus noise (THD+N) of 0.1% over the 20Hz–20kHz frequency range. It also features an instantaneous peak output power of 75W. The LM2876TF/NOPB is designed to provide excellent signal-to-noise ratio (SNR) of greater than 95 dB and low noise floor, making it suitable for high-quality audio applications.
Key Specifications
| Parameter | Conditions | Value | Units |
|---|---|---|---|
| Continuous Average Output Power | Into 8Ω load | 40 | W |
| Instantaneous Peak Output Power | 20Hz–20kHz | 75 | W |
| Signal-to-Noise Ratio (SNR) | A-Weighted, Measured at 1 kHz | ≥95 | dB |
| Total Harmonic Distortion + Noise (THD+N) | Rated output into 8Ω load | 0.1% | |
| Supply Voltage Range | No signal | 20V to 72V | V |
| Output Current Limit | Internally limited | 4 A (min) | A |
| Junction Temperature | Maximum | 150°C | °C |
| Power Dissipation | Maximum | 125 W | W |
Key Features
- High-Performance Audio Amplification: Capable of delivering 40W continuous average power and 75W instantaneous peak power.
- Low Distortion and Noise: THD+N of 0.1% and SNR greater than 95 dB.
- Input Mute Function: Allows the user to mute the audio by drawing less than 0.5 mA from pin 8.
- Output Protection: Includes protection against shorts to ground or the supplies, over-voltage transients, and thermal runaway.
- Supply Under-Voltage Protection: Prevents internal biasing when supply voltages are below 12V.
- Thermal Protection: Shuts down the device at 165°C and restarts at 155°C to prevent long-term thermal stress.
- Wide Supply Range: Operates from 20V to 72V supply voltage.
Applications
- Component Stereo Systems: Ideal for high-quality stereo setups.
- Compact Stereo Systems: Suitable for compact and portable audio systems.
- Self-Powered Speakers: Can be used in active speaker designs.
- Surround-Sound Amplifiers: Applicable in home theater systems.
Q & A
- What is the continuous average output power of the LM2876TF/NOPB?
The LM2876TF/NOPB can deliver 40W of continuous average power into an 8Ω load.
- What is the instantaneous peak output power of the LM2876TF/NOPB?
The instantaneous peak output power is 75W.
- What is the signal-to-noise ratio (SNR) of the LM2876TF/NOPB?
The SNR is greater than 95 dB.
- How does the input mute function work on the LM2876TF/NOPB?
The mute function is activated by drawing less than 0.5 mA from pin 8 of the device.
- What kind of output protection does the LM2876TF/NOPB have?
The device includes protection against shorts to ground or the supplies, over-voltage transients, and thermal runaway.
- What is the thermal protection mechanism of the LM2876TF/NOPB?
The device shuts down at 165°C and restarts at 155°C to prevent long-term thermal stress.
- What is the supply voltage range for the LM2876TF/NOPB?
The device operates from 20V to 72V supply voltage.
- What are some common applications of the LM2876TF/NOPB?
Common applications include component stereo systems, compact stereo systems, self-powered speakers, and surround-sound amplifiers.
- How does the LM2876TF/NOPB protect against under-voltage conditions?
The device has under-voltage protection that prevents internal biasing when supply voltages are below 12V.
- What is the maximum junction temperature for the LM2876TF/NOPB?
The maximum junction temperature is 150°C.
