This document is a datasheet for the LME49811 audio power amplifier. The amplifier has high fidelity and output power can be scaled according to the supply voltage and number of output devices. In addition, the amplifier also has a thermal shutdown circuit that will activate when the die temperature exceeds 150°C.
The LME49811 is a high‑fidelity audio power‑amplifier input stage designed for demanding consumer and professional‑audio applications. It can be used in powered subwoofers, studio monitors, audio‑video receivers, guitar amplifiers, and high‑voltage industrial equipment. The device includes thermal shutdown circuitry that activates when the die temperature exceeds 150 °C.
Key features include a wide operating voltage range of +20 V to +100 V, very high voltage operation, scalable output power, minimal external components, and external compensation. The datasheet provides pin descriptions, absolute maximum ratings, electrical characteristics, and performance graphs such as THD+N versus frequency and output voltage.
| Operating voltage range | +20 V to +100 V |
|---|---|
| Thermal shutdown temperature | 150 °C |
| THD+N (f = 1 kHz) | 0.00035 % (typ) |
The device shuts down when the die temperature exceeds 150 °C.
The recommended supply voltage range is +20 V to +100 V.
Typical THD+N at 1 kHz is 0.00035 %.
Pin 2 is the SD Shutdown Control pin.