通道音频放大器至25 wbtl规格书tda8947.pdf

TDA8947J

4-channelaudioamplifier(SE:1Wto25W;BTL:4Wto50W)

Rev.01—06February2004Preliminarydata

1.Generaldescription

TheTDA8947Jcontainsfouridenticalaudiopoweramplifiers.TheTDA8947Jcanbe

usedas:fourSingle-Ended(SE)channelswithafixedgainof26dB,twotimes

Bridge-TiedLoad(BTL)channelswithafixedgainof32dBortwotimesSEchannels

(26dBgain)plusoneBTLchannel(32dBgain)operatingasa2.1system.

TheTDA8947Jcomesina17-pinDil-Bent-Sil(DBS)powerpackage.TheTDA8947J

ispincompatiblewiththeTDA8944AJandTDA8946AJ.

TheTDA8947Jcontainsauniqueprotectioncircuitthatissolelybasedonmultiple

temperaturemeasurementsinsidethechip.Thisgivesmaximumoutputpowerforall

supplyvoltagesandloadconditionswithnounnecessaryaudioholes.Almostany

supplyvoltageandloadimpedancecombinationcanbemadeaslongasthermal

boundaryconditions(numberofchannelsused,externalheatsinkandambient

temperature)allowit.

2.Features

nSE:1Wto25W,BTL:4Wto50Woperationpossibility(2.1system)

nSoftclipping

nStandbyandmutemode

nNoon/offswitchingplops

nLowstandbycurrent

nHighsupplyvoltageripplerejection

nOutputsshort-circuitprotectedtoground,supplyandacrosstheload