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LM4863
Dual 1.1W Audio Amplifier plus Stereo Headphone Function
TL/H/12881
LM4863
Dual
1.1W
Audio
Amplifier
plus
Stereo
Headphone
Function
November 1996
LM4863 BoomerÉ Audio Power Amplifier Series
Dual 1.1W Audio Amplifier
plus Stereo Headphone Function
General Description
The LM4863isa dual bridge-connected audio power ampli-
fier capableof delivering 1.1Wof continuousaverage poweran8X loadwith less than 0.5% (THD) usinga5V power
supply.In addition, enablingthe headphone inputpin allows
the amplifierstobe operatedin single-ended modeto drive
stereo headphones.
Boomer audio power amplifiers were designed specifically provide high quality output power froma surface mount
package while requiringa minimal amountof external com-
ponents. Sincethe LM4863 incorporates both dual bridge
speaker driveand stereo headphone functionalityon chip,it optimally suitedfor multimedia environments.
The LM4863 featuresan externally controlled, low-power
consumption shutdown mode,a stereo headphone amplifier
mode,and thermal shutdown protection.It also utilizescir-
cuitryto reduce ‘‘clicksand pops’’ during device turn-on.
The closed loop responseofthe unity-gain stable LM4863,
canbe configuredby external gain-setting resistors.
Key Specifications Bridged ModeÐTHDat1W continuous
average output powerinto8X 0.5% (max) Single-Ended ModeÐTHDat75 mW
continuous average output powerinto 32X 0.5% (max) Shutdown current 0.7mA (typ) Output powerat 10% THDaNinto8X 1.5W (typ)
Features Stereo Headphone Amplifier Mode ‘‘Clickand Pop’’ Suppression Circuitry Minimal Amountof External Components Small Outlineand Dual-In-Line Packaging Available Unity-Gain Stable External Gain Configuration Capability Thermal Shutdown Protection Circuitry
Applications Multimedia Monitors Portable and Desktop Computers Portable Televisions
Typical Application
TL/H/12881–1
FIGURE1. Typical Audio Amplifier Application Circuit Refertothe section ProperSelectionof External Components,fora detailed discussionof CBsize.
Connection
Diagram
TL/H/12881–2
Top View
Order Number LM4863
See NSPackage Number
M16BforSO
See NSPackage Number
N16AforDIP
BoomerÉisaregistered trademarkof National SemiconductorCorporation.
C1996National SemiconductorCorporation RRD-B30M116/Printed inU.S.A. http://
