The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown. The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range.
The LM1875 is a monolithic 20 W audio power amplifier designed for low distortion and high‑quality performance in consumer audio applications. It operates from a wide supply range (16 V‑60 V) and can deliver up to 30 W into an 8 Ω load with appropriate supply voltage.
The document includes absolute maximum ratings, detailed electrical characteristics, typical performance curves, layout recommendations, thermal management guidance, and mechanical dimensions for the TO‑220 plastic package. Application hints cover stability, distortion control, protection features, and heat‑sink selection.
| Supply Voltage Range | 16 V‑60 V |
|---|---|
| Total Harmonic Distortion (THD) | 0.015 % at 1 kHz, 20 W |
| Open Loop Gain | 90 dB |
| Current Limit | 4 A |
The absolute maximum supply voltage is 60 V.
Typical THD is 0.015 % at 1 kHz when delivering 20 W.
It is supplied in a plastic TO‑220 power package.