Texas Instruments LM48512 Handleiding

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LM48512

www.ti.com

SNAS497A–OCTOBER2010–REVISEDAPRIL2012

LM48512Boomer®AudioPowerAmplifierSeriesPowerWise®Boosted,UltraLow-EMI,

Mono,E

2

SClassDAudioPowerAmplifier

CheckforSamples:LM48512

1

FEATURES

•"ClickandPop"suppression

2

•E

2

SSystemReducesEMIwhilePreserving

APPLICATIONS

AudioQualityandEfficiency

•Mobilephones

•IntegratedBoostConverter

•Smartphones

•SupplyVoltageLevelDetectiononBoost

Converter•PDAs

•LowPowerShutdownMode

DESCRIPTION

PartofNational’sPowerWisefamilyorproducts,theLM48512delivers1.8Winto8Ω,whileconsuming14.5mA

ofquiescentcurrent.TheLM48512alsofeaturesNational’sEnhancedEmissionsSuppression(E

2

S)system,a

patented,ultralowEMIPWMarchitecturethatsignificantlyreducesRFemissionswhilepreservingaudioquality

andefficiency.LM48512improvesbatterylife,reducesexternalcomponentcount,boardareaconsumption,

systemcost,andsimplifiesdesign.

TheLM48512isdesignedtomeetthedemandsofportablemultimediadevices.TheLM48512featureshigh

efficiencycomparedtootherboostedamplifiersandlowEMIClassDamplifiers.TheLM48512iscapableof

drivingan8Ωspeakerto5.5Vlevels(1.8W)froma3.6Vsupplywhileoperatingat82%efficiency.Flexiblepower

supplyrequirementsallowoperationfrom2.3Vto5.5V.TheE

2

Ssystemfeaturesapatentededgeratecontrol

(ERC)architecturethatfurtherreducesemissionsbyminimizingthehighfrequencycomponentofthedevice

output,whilemaintaininghighqualityaudioreproduction(THD+N=0.03%)andhighefficiency.Alowpower

shutdownmodereducessupplycurrentconsumptionto0.04μA.

TheLM48512featuresabattery-savingautomaticgaincontrol(AGC).TheAGCdetectsthebatteryvoltageand

reducesthegainoftheamplifiertolimittheoutputasthebatteryvoltagedecreases.

Superiorclickandpopsuppressioneliminatesaudibletransientsonpower-up/downandduringshutdown.

Table1.KeySpecifications

VALUEUNIT

■PowerOutputatV

DD

=3.6V

1.8W(typ)

R

L

=8Ω,THD+N≤1%

■Efficiencyat3.6V,800mWinto8Ω82%(typ)

■QuiescentPowerSupplyCurrent

14.5mA

at3.6V

■Shutdowncurrent0.04μA(typ)

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2010–2012,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties