www.德州仪器.com
usinglow-esrcapacitors
打印-circuitboard(pcb)布局
TPA3007D1
SLOS418A–SEPTEMBER2003–REVISEDDECEMBER2004
ideally,thedeviceshouldbeheldinshutdownwhenthesystempowersupandbroughtoutofshutdownonce
anydigitalcircuitryhassettled.不管怎样,ifshutdownistobeleftunused,theterminalmaybeconnected
directlytoV
CC
.
低-esrcapacitorsarerecommendedthroughoutthisapplicationsection.areal(asopposedtoideal)电容
canbemodeledsimplyasaresistorinserieswithanidealcapacitor.thevoltagedropacrossthisresistor
minimizesthebeneficialeffectsofthecapacitorinthecircuit.thelowertheequivalentvalueofthisresistance
themoretherealcapacitorbehaveslikeanidealcapacitor.
becausethetpa3007d1isaclass-damplifierthatswitchesatahighfrequency,thelayoutoftheprinted-电路
板(pcb)shouldbeoptimizedaccordingtothefollowingguidelinesforthebestpossibleperformance.
•
decouplingcapacitors—asdescribedinthepowersupplydecouplingsection,thehigh-frequency0.1-uf
decouplingcapacitorsshouldbeplacedasclosetothepvcc(pin9andpin16)andvcc(pin24)terminals
aspossible.thebypass(pin22)电容,vref(pin23)电容,andvclamp(pin7)capacitorshould
alsobeplacedasclosetothedeviceaspossible.thelarge(10uforgreater)bulkpowersupplydecoupling
capacitorshouldbeplacednearthetpa3007d1.
•
grounding—thevcc(pin24)decouplingcapacitor,vref(pin23)电容,绕过(pin22)电容,
cosc(pin21)电容,androsc(pin20)resistorshouldeachbegroundedtoanalogground(agnd,
pin18andpin19).thepvcc(pin9andpin16)decouplingcapacitorsshouldeachbegroundedtopower
地面(pgnd,pin12andpin13).analoggroundandpowergroundshouldbeconnectedasacentral
groundconnectionorstargroundforthetpa3007d1.
•
outputfilter—theferritefilter(figure16)shouldbeplacedasclosetotheoutputterminals(pins10,11,14,
and15)aspossibleforthebestemiperformance.thelcfilter(figure17)shouldbeplacedclosetothe
ferritefilter.thecapacitorsusedinboththeferriteandlcfiltersshouldbegroundedtopowerground.
foranexamplelayout,refertothetpa3007d1evaluationmodule(tpa3007d1evm)usermanual,tiliterature
numberslou164,availableonthetiwebsiteathttp://www.德州仪器.com.
forfurtherlayoutinformation,referto
LayoutGuidelinesforTPA300xSeriesParts
,tiliteraturenumber
sloa103,alsoavailableonthetiwebsite.
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