LM4781 - Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute
Datasheet Packaging Samples & Pricing Reliability Knowledge Base

Features
•SPiKe Protection
•Low external component count
•Quiet fade-in/out mute mode
•Wide supply range: 20V - 70V
•Signal-to-Noise Ratio >= 93dB (ref. to PO = 1W)

Key Specification

Output Power/Channel with 0.5% THD+N, 1kHz into 835W (typ)
THD+N at 3 x 20W into 8 (20Hz - 20kHz)0.2% (typ)
THD+N at 3 x 20W into 6 (20Hz - 20kHz)0.3% (typ)
THD+N at 3 x 20W into 4 (20Hz - 20kHz)0.5% (typ)
Mute Attenuation110dB (typ)
PSRR85dB (min)
Slew Rate9V/µs (typ)

General Description

The LM4781 is a three channel audio amplifier capable of typically delivering 35W per channel of continuous average output power into an 8 load with less than 0.5% THD+N from 20Hz - 20kHz. More...


Applications

•Audio amplifier for component stereo
•Audio amplifier for compact stereo
•Audio amplifier for self-powered speakers
•Audio amplifier for high-end and HD TVs
  Typical Application
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ParametersValues
Power@ 4Ohms, 1% THD 35 Watt
Power@ 8Ohms, 1% THD 25 Watt
THD 0.02 %
PSRR 125 dB
SNR 107 dB
Channels 3 Channels
THD Conditions 56V,Rl=8ohm
PSRR Conditions v+=30V to 10V, V-=30V
SNR Conditions Po=25Wrms,A-weighted filter,fin=1kHz,Rs=25ohm
User Supply 56 Volt
Supply Range +20 - +70V
Mute/Shutdown Mute
Mono/Stereo 3 Ch
Gain Bandwidth 8 MHz
Slew Rate 9 Volts/usec
Temperature Min -20 deg C
Temperature Max 85 deg C


Typical Performance

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  Connection Diagram
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*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM4781 Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute 1125
Kbytes		 20-Aug-03 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM4781TATO-22027NOPB1NARoHS Download Full productionN/A
Samples
Buy Now 		1K+$5.62rail
of
15		NSUZXYTTE#
L4781TA
6 weeks100

General Description

The LM4781 is a three channel audio amplifier capable of typically delivering 35W per channel of continuous average output power into an 8 load with less than 0.5% THD+N from 20Hz - 20kHz.

The LM4781 is fully protected utilizing National's Self Peak Instantaneous Temperature (°Ke) (SPiKeTM) protection circuitry. SPiKe provides a dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the LM4781's outputs against over-voltage, under-voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature peaks. The advanced protection features of the LM4781 places it in a class above discrete and hybrid amplifiers.

Each amplifier of the LM4781 has an independent smooth transition fade-in/out mute.

The LM4781 can easily be configured for bridge or parallel operation for higher power and bi-amp solutions.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM4781TAHV7000138500014925003423500950

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 8-Nov-2009]