National Semiconductor - LME49811 High Fidelity 200V Power Amplifier Input Stage with Shutdown
Summary
The LME49811 is a high fidelity audio power amplifier input stage engineered for robust, demanding audio applications. Featuring wide operating voltage ranges (±20V to ±100V), industry-leading PSRR, and low THD+N, this component delivers exceptional performance necessary for professional pro-audio equipment up to 500 watts and beyond. The comprehensive manual provides detailed technical specifications, application circuits, and usage guidelines, making it essential for designers building powered subwoofers, audio video receivers, and high voltage industrial monitors.
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January 4, 2008
LME49811 Audio Power Amplifier Series High Fidelity 200 Volt Power Amplifier Input Stage with Shutdown General Description Key Specifications The LME49811 is a high fidelity audio power amplifier input
■ Wide operating voltage range ±20V to ±100V
stage designed for demanding consumer and pro-audio ap-
plications. Amplifier output power may be scaled by changing ■ PSRR (f = DC) 115d B (typ)
the supply voltage and number of output devices. The
■ THD+N (f = 1k Hz) 0.00035% (typ)
LME49811 is capable of driving an output stage to deliver in
excess of 500 watts single-ended into an 8 ohm load in the ■ Output Drive Current 9m A
presence of 10% high line headroom and 20% supply regu- lation. Features The LME49811 includes thermal shut down circuitry that ac-
Very high voltage operation
tivates when the die temperature exceeds 150°C. The
Scalable output power
LME49811's shutdown function when activated, forces the
LME49811 into shutdown state. Minimum external components External compensation Thermal Shutdown
Applications Powered subwoofers Pro audio Powered studio monitors Audio video receivers Guitar Amplifiers High voltage industrial applications
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
Overture® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation www.national.com
Page Summary Contents For National Semiconductor - LME49811 High Fidelity 200V Power Amplifier Input Stage with Shutdown
Manual Details
| Brand | National |
|---|---|
| Pages | 18 |
| File Size | 634.75 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the operating voltage range for this amplifier?
It features a wide operating voltage range of ±20V to ±100V.
How much output power can the LME49811 deliver?
It can deliver in excess of 500 watts single-ended into an 8 ohm load.
Does the device have built-in protection features?
Yes, it includes thermal shut down circuitry that activates if the die temperature exceeds 150°C.
What do I need to use the amplifier in 'play' mode?
To put the part in “play” mode, you must apply 1.5V to the Shutdown Control pin (SD).
Can this circuit be used for industrial applications?
Yes, its typical applications include high voltage industrial and pro audio settings.