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) 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. Key Specification Output Power/Channel with 0.5% THD+N, 1kHz into 8 35W (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 Attenuation 110dB (typ) PSRR 85dB (min) Slew Rate 9V/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

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Typical Application click for larger image	Connection Diagram *click for larger image *click for larger image
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Datasheet

Title		Size	Date	Other Language
	LM4781 Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute	1125 Kbytes	20-Aug-03

Featured Application Notes

Title		Size	Date	Other Language
	AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage	655 Kbytes	24-May-07	中文
	AN-1490: Application Note 1490 LM4702 Power Amplifier	1033 Kbytes	26-May-06	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage	655 Kbytes	24-May-07	中文
	AN-1490: Application Note 1490 LM4702 Power Amplifier	1033 Kbytes	26-May-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4781TA	HV700	0	13850	0	0	1492500	3	423500950

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.

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