LM2876T/NOPB

Overview

The LM2876T/NOPB is a high-performance Class-AB audio power amplifier delivering 40W continuous average output into an 8Ω load with 0.1% THD+N from 20Hz to 20kHz. It features SPiKe protection for dynamic Safe Operating Area safeguarding against overvoltage, undervoltage, and thermal runaway. The device operates on a wide supply range of 20V to 60V (absolute maximum 72V) and includes an input mute function. Electrical characteristics include a minimum signal-to-noise ratio of 95dB, typical THD+N of 0.06%, and a gain-bandwidth product of 8MHz.

Feature Summary

• Integrates SPiKe protection circuitry for dynamic Safe Operating Area safeguarding against overvoltage, undervoltage, and thermal stress.
• Provides an input mute function to eliminate turn-on and turn-off transients when the supply voltage is insufficient.
• Delivers high-fidelity audio performance with low total harmonic distortion plus noise and excellent linearity.
• Features internal current limiting and over-voltage protection to safeguard outputs against shorts and inductive load transients.

Applications

• Component stereo systems
• Compact stereo setups
• Self-powered speakers
• Surround-sound amplifiers
• High-end stereo televisions

Procurement Notes

Verify the specific package variant upon ordering. The 'T' suffix indicates a non-isolated TO-220 package where the tab connects to V-. Ensure proper isolation components are used if the heat sink must remain at ground potential. Confirm that the design accommodates the required thermal dissipation for the intended power output levels.

Selection Notes

Select this component for designs requiring robust output protection and high power delivery in a through-hole package. Verify that the system's power supply can support the required voltage range and that adequate heatsinking is implemented to prevent thermal shutdown during peak operation. Consider the single-ended input configuration for compatibility with standard audio sources.

Part Context

This part belongs to the Overture Audio Power Amplifier Series by Texas Instruments. It is designed as a high-performance alternative to discrete and hybrid amplifiers, offering integrated protection features typically found in more complex designs. The device is suitable for applications demanding reliable high-power audio reproduction with minimal external protection circuitry.

Replacement Considerations

Public confirmed substitute: LM2876TF/NOPB. Note that the 'TF' suffix denotes an isolated package variant. If using the non-isolated LM2876T/NOPB, ensure the heat sink is connected to the negative supply rail or use an insulating washer to isolate it from V-.

FAQ

How does the under-voltage protection function?

The under-voltage protection prevents internal biasing when the total supply voltage is less than 12V. This eliminates turn-on and turn-off transients by ensuring the amplifier only activates once the supplies have reached sufficient levels.

What is the purpose of the SPiKe protection circuitry?

SPiKe (Self Peak Instantaneous Temperature) protection dynamically safeguards the output against overvoltage, undervoltage, overloads including shorts to supplies, thermal runaway, and instantaneous temperature peaks, maintaining a safe operating area.