LM4861_03 NSC [National Semiconductor], LM4861_03 Datasheet

LM4861_03

Manufacturer Part Number

LM4861_03

Description

1.1W Audio Power Amplifier with Shutdown Mode

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM4861_03.pdf (12 pages)

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LM4861

1.1W Audio Power Amplifier with Shutdown Mode

General Description

The LM4861 is a bridge-connected audio power amplifier

capable of delivering 1.1W of continuous average power to

an 8Ω load with 1% THD+N using a 5V power supply.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components using surface mount packaging. Since

the LM4861 does not require output coupling capacitors,

bootstrap capacitors, or snubber networks, it is optimally

suited for low-power portable systems.

The LM4861 features an externally controlled, low-power

consumption shutdown mode, as well as an internal thermal

shutdown protection mechanism.

The unity-gain stable LM4861 can be configured by external

gain-setting resistors for differential gains of up to 10 without

the use of external compensation components. Higher gains

may be achieved with suitable compensation.

Connection Diagram

Boomer

is a registered trademark of National Semiconductor Corporation.

DS011986

See NS Package Number M08A

Order Number LM4861M

Small Outline Package

Top View

Key Specifications

Features

n No output coupling capacitors, bootstrap capacitors, or

n Small Outline (SO) packaging

n Compatible with PC power supplies

n Thermal shutdown protection circuitry

n Unity-gain stable

n External gain configuration capability

Applications

n Personal computers

n Portable consumer products

n Self-powered speakers

n Toys and games

snubber circuits are necessary

average output power into 8Ω

at 1kHz into 8Ω

THD+N for 1kHz at 1W continuous

Output power at 10% THD+N

Shutdown Current

01198602

February 2003

www.national.com

1.0% (max)

0.6µA (typ)

1.5W (typ)

Related parts for LM4861_03

LM4861_03 Summary of contents

Page 1

LM4861 1.1W Audio Power Amplifier with Shutdown Mode General Description The LM4861 is a bridge-connected audio power amplifier capable of delivering 1.1W of continuous average power to an 8Ω load with 1% THD+N using a 5V power supply. Boomer audio ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 01198601 ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction ...

Page 4

High Gain Application Circuit Single Ended Application Circuit *C and C size depend on specific application requirements and constraints. Typical vaiues **Pin 1 should be connected disable the amplifier or to GND to ...

Page 5

External Components Description (Figures 1, 2) Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with high pass filter with Input coupling capacitor which blocks DC voltage at the amplifier’s ...

Page 6

Typical Performance Characteristics THD+N vs Output Power Output Power vs Supply Voltage Noise Floor vs Frequency www.national.com (Continued) 01198610 Power Dissipation vs 01198618 Supply Current Distribution 01198614 6 Output Power vs Load Resistance 01198617 Output Power 01198616 vs Temperature 01198615 ...

Page 7

Typical Performance Characteristics Supply Current vs Supply Voltage Power Supply Rejection Ratio (Continued) Power Derating Curve 01198612 Frequency Response 01198620 7 01198613 Open Loop 01198619 www.national.com ...

Page 8

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1 , the LM4861 has two operational amplifiers internally, allowing for a few different amplifier configurations. The first amplifier’s gain is externally config- urable, while the second amplifier is internally fixed ...

Page 9

Application Information possible high frequency oscillations. Care should be taken when calculating the −3dB frequency in that an incorrect combination of R and C will cause rolloff before 20kHz typical combination of feedback resistor and capacitor that ...

Page 10

LM4861 MDA MWA 1.1W Audio Power Amplifier with Shutdown Mode DIE/WAFER CHARACTERISTICS Fabrication Attributes Physical Die Identification Die Step Physical Attributes Wafer Diameter Dise Size (Drawn) Thickness Min Pitch Special Assembly Requirements: Note: Actual die size is rounded to the ...

Page 11

LM4861 MDA MWA 1.1W Audio Power Amplifier with Shutdown Mode IN U.S.A Tel #: Fax: IN EUROPE Tel: Fax: IN ASIA PACIFIC Tel: IN JAPAN Tel: (Continued) 1 877 Dial Die 1 877 342 5343 1 207 541 6140 49 ...

Page 12

Physical Dimensions unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outllne Package, JEDEC (M) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE ...

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