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LM4781  Product Folder

Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute
Generic P/N 4781
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics

Parametric Table Parametric Table
Temperature Min (deg C) -20 
Temperature Max (deg C) 85 
Channels (Channels) 3 
User Supply (Volt) 56 
Supply Range ± 20 - ± 84 V 
Gain Bandwidth (MHz) 8 
Slew Rate (Volts/usec) 9 
PowerAtFourOhms OnePercentTHD (Watt) 25 
PowerAtEightOhms OnePercentTHD (Watt) 35 
PowerAtFourOhms TenPercentTHD (Watt) - 
PowerAtEightOhms TenPercentTHD (Watt) - 
SNR (dB) 107 
SNR Conditions Po=25Wrms, A-weighted filter, fin=1kHz, Rs=25ohm 
PSRR (dB) 125 
PSRR Conditions v+=30V to 10V, V-=30V 
THD (%) .02 
THD Conditions 56V, Rl=8ohm 

Datasheet

TitleSize in KbytesDate
View Online
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LM4781 Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute 1125 Kbytes 20-Aug-03 View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM4781TATO 22027StatusFull productionN/AN/ASamples1K+$3.25rail
of
15		NSUZXYTT
L4781TA
6 weeks0

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.

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)

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

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM4781TAHV70008800006000006169643205

For more information on Reliablitity Metrics, please click here.


[Information as of 15-Jan-2004]

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