LM3875 - High-Performance 56W Audio Power Amplifier

Datasheet	Packaging	Samples & Pricing	Design Tools	Knowledge Base

Features

•	56W continuous average output power into 8
•	100W instantaneous peak output power capability
•	Signal-to-Noise Ratio >95dB (min)
•	Output protection from a short to ground or to the supplies via internal current limiting circuitry
•	Output over-voltage protection against transients from inductive loads
•	Supply under-voltage protection, not allowing internal biasing to occur when \|V+\| + \|V-\| <= 12V, thus eliminating turn-on and turn-off transients
•	11 lead TO-220 package
•	Wide supply voltage range: \|V+\| + \|V-\| = 20V to 84V

General Description

The LM3875 is a high-performance audio power amplifier capable of delivering 56W of continuous average power to an 8

load with 0.1% THD+N from 20Hz to 20kHz.

Applications

•	Component or compact stereos
•	Self-powered speakers
•	Surround-sound amplifiers
•	High-end stereo TVs

Typical Application

click for larger image

Parameters Values

Output Current 6000 mA

Offset Voltage max, 25C 10 mV

Gain Bandwidth 8 MHz

Supply Min 20 Volt

Supply Max 84 Volt

Supply Current Per Channel 30 mA

PowerWise Rating 2 3750 uA/MHz

Slew Rate 11 Volts/usec

Input OutputType Not Rail to Rail

Max Input Bias Current 1000 nA

Shut down No

Special Features AvCl>10

Function Op Amp

Channels 1 Channels

Temperature Min 0 deg C

Temperature Max 70 deg C

Typical Performance

*click for larger image

Also Recommended

LM4780

Dual Amplifier, Improved SNR

Additional Resources

Design Tools

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM3875 Overture™ Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier	1006 Kbytes	10-Nov-04	Download
LM3875 Overture™ Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier (Japanese)	557 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM3875TF

ISOLATED TO220

NOPB

RoHS

N/A

Full production

N/A

1K+

$3.43

rail
of
20

NSUZXYTTE#
LM3875TF

6 weeks

500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM3875T	LM3886T	NATIONAL SEMICONDUCTOR	05 Mar 2008

General Description

The LM3875 is a high-performance audio power amplifier capable of delivering 56W of continuous average power to an 8 load with 0.1% THD+N from 20Hz to 20kHz.

The performance of the LM3875, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe™) protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, caused by shorts to the supplies, thermal runaway, and instantaneous temperature peaks.

The LM3875 maintains an excellent signal-to-noise ratio of greater than 95dB(min) with a typical low noise floor of 2.0µV. It exhibits extremely low THD+N values of 0.06% at the rated output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

Design Tools

Title	Size in Kbytes	Date
Amplifiers Selection Guide software for Windows			View

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes

Title	Size in Kbytes	Date
AN-898: Application Note 898 Audio Amplifiers Utilizing: SPiKe Protection	1412 Kbytes	20-Sep-02	Download
AN-898 (Japanese): Application Note 898 Audio Amplifiers Utilizing: SPiKe Protection	249 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 8-Nov-2009]