National Semiconductor recently extended its high-fidelity LME audio amplifier family with the introduction of a pair of 200 V mono audio power amplifier input stages that deliver low distortion performance.
These highly-integrated, single-chip devices accelerate the design of high-end consumer and professional audio applications that span powered studio monitors and subwoofers, audio/visual (AV) receivers, commercial sound reinforcement, automotive after-market audio, professional mixers, distributed audio and guitar amplifiers. They also address a wide range of industrial applications where high voltage and low distortion are required.
The LME49811 and LME49830 offer scalable output power based on supply voltage and output device count. With these devices, designers can use the same base circuit design to create multiple power-level solutions up to 1 kW amplifiers, just by scaling the output stage devices to accommodate for more power dissipation and current drive. When implemented in a complete power amplifier design, the LME49811's total harmonic distortion plus noise (THD+N) is a remarkably low 0,00035%, while the LME49830's figure is 0,0006%.
Both devices contain all the essential circuitry required for a high-quality, high-performance power amplifier input stage. They save board space and design time by replacing more than 25 discrete components (many of which must be hand selected and matched by the audio system designer) in high-power audio amplifiers. This enables designs with more channels and more power per square-centimetre of chassis space. These devices also provide designers more time to differentiate their output stage and power supply design, as well as 'tune' the amplifier's overall sound.
Both devices are capable of driving an output stage to deliver in excess of 500 W single-ended into an 8 Ω load. They provide a wide operating voltage range of ±20 V to ±100 V and feature slew rates of 40 V/μs and power supply rejection ratio of 115 dB. The LME49811 drives Darlington or bipolar power transistors in an amplifier's output stage and is capable of 9 mA output drive current with 100 μV output voltage noise. The LME49830 is optimised to drive a wide range of MOSFETs with standard and low threshold voltages. The device's 60 mA output current capability, combined with output voltage noise of 41 μV, increases design flexibility when selecting output stage configurations. Both devices are also protected by a thermal shutdown feature.
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