NS launches 200V audio power amplifier driver

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National Semiconductor (NS) announced another new model of the 200V power amplifier output stage driver family. The LME49810's 200V single-chip driver has a built-in Baker compensating clamp that performs many of the discrete components, allowing the high-power audio amplifier to save more than 25 discrete components. The LME49810 chip is part of National's high-performance audio chip family and is the latest model since the introduction of the LM4702 stereo driver. At the same time, National Semiconductor announced in a separate press release two new audio op amp families (44V and 34V), including the LME49860, LME49710, LME49720 and LME49740, which feature total harmonic distortion and noise ( THD+N) is lower than the same level products on the market.

The LME49810 chip contains the audio circuitry required for a high-quality, high-performance power amplifier output stage driver. Functionally speaking, an LME49810 chip can replace multiple discrete components. The advantage is that the engineer who designs the audio system does not need to personally select components for the audio system, and does not need to spend time researching whether the selected components are interoperable, and because of the technical height. Integration, so engineers can reduce board area and shorten design cycles. The LME49810 chip not only saves system cost, streamlines design, but also allows for a slimmer, more stylish form factor and increases channel density and power density in the backplane.

The LME49810 chip is ideal for high-end consumer electronics and professional audio equipment, including active studio monitors and subwoofers, audio/video receivers, commercial PA systems, and after-market audio. Professional-grade mixers, distributed audio and guitar amplifiers. This chip is also suitable for a variety of high voltage and low distortion industrial audio systems.

National's LME49810 chip can drive high-power discrete transistors, making it ideal for audio systems with output powers up to 3000W. As long as this chip is added to the power amplifier system, the total harmonic distortion and noise can be reduced to only 0.0007%. Since the LME49810 chip can output 50mA, the system design engineer decides which output stage configuration to use, there are more options, and the output power of the amplifier can be easily adjusted up and down by changing the supply voltage of the output stage. Output configuration, or use different power transistors. Thanks to the built-in Baker compensating clamp circuit, the clamp circuit protects the amplifier even if it has been overdriven. For example, if the amplifier is close to its clipping level, the Baker compensating clamp circuit not only minimizes distortion, but also minimizes damage if the speaker is damaged.

The LME49810 has a slew rate of up to 50V/us, a power supply rejection ratio (PSRR) of up to 110dB, and operates over a wide voltage range of +/-20V to +/-100V. In order to avoid damage caused by long-term operation in high temperature environment, LME49810 chip has built-in advanced overheat protection circuit, this protection circuit will start whenever the die temperature exceeds 150 degrees Celsius. The chip also has a built-in mute circuit that suppresses switching/switching noise.

The LME49810 is available in a 15-pin TO-247 package and is priced at $1,500 each in 1,000-unit quantities.

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