LM1875 power amplifier
The LM1875 is a high-performance audio power amplifier IC designed for audio applications requiring moderate power output and excellent sound quality. Manufactured by Texas Instruments, this IC operates as a monolithic power amplifier capable of delivering up to 20 watts of output power into an 8-ohm load with low distortion. The LM1875 is designed to be used in audio amplification systems for hi-fi stereo amplifiers, home theater systems, and other audio equipment where reliable and high-quality sound reproduction is critical.
Key Features:
- Power Output: Up to 20 watts into an 8-ohm load at ±25V supply voltage
- Low Total Harmonic Distortion (THD): 0.015% (typical) at 1 kHz, 20 watts
- Wide Supply Voltage Range: ±16V to ±60V
- High Signal-to-Noise Ratio (SNR): 95 dB (typical)
- Short Circuit Protection: Ensures robustness against load faults
- Thermal Shutdown Protection: Protects against overheating
- External Components: Minimal external components required for operation
- Package Type: TO-220-11 (single in-line package)
- Output Power: Up to 20W into 8 ohms, 30W into 4 ohms (with proper heat sinking)
- Supply Voltage Range: ±16V to ±60V (recommended ±25V)
- Input Impedance: 150 kΩ (typical)
- Frequency Response: 10 Hz to 100 kHz (-3 dB)
- Total Harmonic Distortion + Noise (THD+N): 0.015% at 1 kHz, 20W into 8 ohms
- Slew Rate: 4V/µs (typical)
- Operating Temperature Range: 0°C to +70°C
- Audio Amplifiers: Hi-fi stereo amplifiers, home theater systems, and PA systems.
- Active Speakers: Powered speakers and studio monitors.
- Instrumentation: Test and measurement equipment requiring audio amplification.
- Consumer Electronics: Audio equipment for home and professional use.
- DIY Audio Projects: Custom audio amplifier designs and hobbyist projects.