Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LME49810
Edited by the Electronicstalk Editorial Team on 24 July 2007
Power amplifier mops up discrete
components
The LME49810 contains all the essential audio circuitry required for a high-quality high-performance power amplifier output stage driver.
The latest addition to the National Semiconductor family of 200V power amplifier output stage drivers, the LME49810 is a single-chip device with integrated Baker clamp that replaces more than 25 discrete components in high-power audio amplifiers The LME49810 joins the LM4702 stereo driver as the newest member of National's high-performance audio family
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The LME49810 contains all the essential audio circuitry required for a high-quality high-performance power amplifier output stage driver.
The single-chip device saves space and design time by replacing a myriad of discrete components - many of which must be hand selected and matched by the audio system designer.
The LME49810 not only reduces system cost and simplifies design, but it also enables slimmer, more elegant designs, with more channels and more power per square-inch of chassis space.
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The LME49810 is optimal for high-end consumer and professional audio applications that span powered studio monitors and subwoofers, audio/visual (AV) receivers, commercial sound reinforcement, aftermarket audio, professional mixers, distributed audio and guitar amplifiers.
The device is also well suited for a wide range of industrial applications where high voltage and low distortion is required.
National's LME49810 is designed to drive high-power discrete transistors in systems delivering up to 3000W.
When implemented in a complete power amplifier design, the THD+N is a remarkably low 0.0007%.
The LME49810's 50mA output current capability increases design flexibility when selecting output stage configurations.
Amplifier output power is easily scaled by varying the output stage supply voltage, output configurations and selection of power transistors.
The driver's integrated Baker clamp offers key advantages when the amplifier is overdriven.
As the amplifier approaches clipping, the Baker clamp not only minimises distortion, but also minimises the potential for speaker damage.
The LME49810 provides a slew rate of 50V/us, a power supply rejection ratio (PSRR) of 110dB and a wide operating voltage range of plus or minus 20V to plus or minus 100V.
To prevent long-term thermal stress, the LME49810 has a sophisticated thermal protection scheme that is activated when the die temperature exceeds 150C.
The device also features no-click, no-pop mute circuitry.
Available now in a 15-lead TO-247 package, the LME49810 is priced at US $8.50 in 100-unit quantities.
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