Features SPiKe Protection Low external component count Quiet fade-in/out mute mode Wide supply range: 20V - 84V Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W) Description The LM4780 is an stereo audio amplifier capable of typically delivering 60W per channel of continuous average output power into an 8Ω load with less than 0.5% THD+N from 20Hz - 20kHz. The LM4780 is fully protected utilizing National's Self Peak Instantaneous Temperature (°Ke) (SPiKe TM) protection circuitry. SPiKe provides a dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the LM4780'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 LM4780 places it in a class above discrete and hybrid amplifiers. Each amplifier of the LM4780 has an independent smooth transition fade-in/out mute. The LM4780 can easily be configured for bridge or parallel operation for 120W mono solutions. Key Specification ■  Output Power/Channel   with 0.5% THD+N, 1kHz into 8Ω 60W (typ) THD+N at 2 x 30W into 8Ω (20Hz - 20kHz) 0.03% (typ) THD+N at 2 x 30W into 6Ω (20Hz - 20kHz) 0.05% (typ) THD+N at 2 x 30W into 4Ω (20Hz - 20kHz) 0.07% (typ) Mute Attenuation 110dB (typ) PSRR 85dB (min) Slew Rate 19V/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

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

Parameters Values Power@ 4Ohms, 1% THD 60 Watt Power@ 8Ohms, 1% THD 55 Watt THD 0.03 % PSRR 120 dB SNR 114 dB Channels 2 Channels THD Conditions Po=60W @ Vs=±35V, RL=4ohms PSRR Conditions V==40V to20V,V-=-40V,Vcm=0V,Io=omA SNR Conditions Po=50Wrms,A-weighted filter,f-in-1kHz,Rs=25ohms User Supply 70 Volt Supply Range +20 - +84V Mute/Shutdown Mute Mono/Stereo Mono/stereo Gain Bandwidth 8 MHz Slew Rate 19 Volts/usec Temperature Min -20 deg C Temperature Max 85 deg C

Datasheets

Title		Size	Date	Other Language
	LM4780 Overture Audio Power Amplifier Series Stereo 60W, Mono 120W Audio Power Amplifier with Mute	897 Kbytes	22-Jan-10

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4780TA/NOPB LM4780TA RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 850 FARNELL Europe and Asia 1025 MOUSER Worldwide 120 NEWARK Americas 374	$6.16 each at 1K+ pcs	rail of 15

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4780.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4780 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4780TABD	Overture Audio Power Amplifier Series Stereo 60W, Mono 120W Audio Power Amplifier with Mute	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$151.00 each	1
The LM4780 is a stereo audio amplifier capable of typically delivering 60W per channel of continuous average output power into an 8Ω load with less than 0.5% THD+N from 20Hz to 20kHz. The LM4780 is fully protected utilizing National's Self Peak Instantaneous Temperature (ºKe) (SPiKe™) protection circuitry which completely safeguards its outputs against over-voltage, under-voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature peaks.

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4780TA/NOPB LM4780TA	7411.708 7419.508	TO-220	27	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# L4780TA

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4780.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4780 is located at RoHS Status.

CAD Symbols and Models Download LM4780 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4780TA	HV700	0	14255	0	0	1582500	3	449038695

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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4780.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4780 is located at RoHS Status.