LM391N 100 Audio Power Driver

Overview

The LM391N 100 is a high-performance audio power driver integrated circuit (IC) designed to drive external power transistors in amplifier applications ranging from 10 to 100 watts. This IC is engineered to deliver true high-fidelity audio performance while operating at high supply voltages. It incorporates built-in protection mechanisms for output faults and thermal overloads, ensuring reliable operation in demanding environments. Additionally, the LM391N 100 allows users to program output transistor protection circuitry, making it a versatile choice for audio amplifier designs.

Features

• High Supply Voltage Operation: Capable of functioning at elevated supply voltages, making it suitable for high-power audio applications.
• True High-Fidelity Performance: Delivers exceptional audio quality with low distortion and wide frequency response.
• Built-In Protection: Includes internal safeguards against output faults and thermal overloads, enhancing system reliability.
• Programmable Output Protection: Allows customization of output transistor protection circuitry to suit specific application requirements.
• Wide Power Range: Supports amplifier designs from 10 to 100 watts, offering flexibility for various audio applications.
• Robust Thermal Management: Designed to handle high power dissipation with thermal overload protection.

Applications

The LM391N 100 is ideal for a variety of audio amplification applications, including:

• Hi-Fi Audio Systems: Provides high-fidelity amplification for home and professional audio systems.
• Public Address (PA) Systems: Suitable for driving speakers in public address and sound reinforcement setups.
• Car Audio Amplifiers: Can be used in automotive audio systems requiring robust power handling.
• Musical Instrument Amplifiers: Ideal for guitar, keyboard, and other instrument amplifiers where high power and clarity are essential.
• Subwoofer Amplifiers: Capable of driving low-frequency speakers with high power output.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LM391N 100:

Absolute Maximum Ratings

• Supply Voltage (V_CC): ±40V
• Output Current (I_O): 5A (peak)
• Power Dissipation (P_D): 50W (with adequate heat sinking)
• Operating Temperature Range (T_op): -40°C to +85°C
• Storage Temperature Range (T_stg): -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): ±20V to ±35V
• Load Impedance (R_L): 4Ω to 8Ω
• Input Signal Level: 1V_RMS (typical)
• Gain Bandwidth Product: 3MHz (typical)

Performance Characteristics

• Total Harmonic Distortion (THD): <0.1% at 1kHz, 20W output
• Signal-to-Noise Ratio (SNR): >90dB
• Frequency Response: 20Hz to 20kHz (±1dB)
• Slew Rate: 10V/µs (typical)

Package Information

The LM391N 100 is available in a robust TO-220 package, which provides excellent thermal performance and ease of mounting. The package details are as follows:

TO-220 Package Dimensions

• Package Type: TO-220 (Vertical Mount)
• Lead Material: Copper Alloy
• Lead Finish: Matte Tin
• Weight: Approximately 2.5 grams
• Thermal Resistance (Junction-to-Case, R_θJC): 3°C/W
• Thermal Resistance (Junction-to-Ambient, R_θJA): 50°C/W (without heat sink)

Pin Configuration

The LM391N 100 features a standard TO-220 pinout with the following configuration:

• Pin 1: Non-Inverting Input (+IN)
• Pin 2: Inverting Input (-IN)
• Pin 3: V_CC (Positive Supply)
• Pin 4: V_EE (Negative Supply)
• Pin 5: Output (OUT)
• Pin 6: Compensation (COMP)
• Pin 7: Ground (GND)

Conclusion

The LM391N 100 is a versatile and high-performance audio power driver IC, offering exceptional fidelity, robust protection features, and flexible application possibilities. Its ability to drive external power transistors in high-power amplifier designs makes it a preferred choice for audio engineers and designers. With its comprehensive protection mechanisms and programmable output safeguards, the LM391N 100 ensures reliable operation in a wide range of audio amplification scenarios. Whether used in hi-fi systems, PA setups, or automotive audio, this IC delivers the power and performance required for professional-grade audio applications.