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TS51221 bảng dữ liệu(PDF) 12 Page - Semtech Corporation

tên linh kiện TS51221
Giải thích chi tiết về linh kiện  High Efficiency Regulator IC for Wireless Power Receiver Applications
PDF  18 Pages
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TS51221 bảng dữ liệu(HTML) 12 Page - Semtech Corporation

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TS51221
Final Datasheet
Rev 1.1
April 6, 2015
www.semtech.com
12 of 18
Semtech
PCB Layout
ForproperoperationandminimumEMI,caremustbetaken
duringPCBlayout.Animproperlayoutcanleadtoissuessuch
aspoorstabilityandregulation,noisesensitivityandincreased
EMIradiation.(figure23)Themainguidelinesarethefollowing:
•
providelowinductiveandresistivepathsforloopswith
highdi/dt,
•
providelowcapacitivepathswithrespecttoalltheother
nodesfortraceswithhighdi/dt,
•
sensitivenodesnotassignedtopowertransmissionshould
bereferencedtotheanalogsignalground(GND)andbe
alwaysseparatedfromthepowerground(PGND).
ThenegativeendsofCBYPASS,COUTandtheSchottkydiode
DCATCH(optional)shouldbeplacedclosetoeachotherand
connectedusingawidetrace.Viasmustbeusedtoconnect
thePGNDnodetothegroundplane.ThePGNDnodemustbe
placedascloseaspossibletotheTS51221PGNDpinstoavoid
additionalvoltagedropintraces.
ThebypasscapacitorCBYPASS(optionallyparalleledtoa0.1µF
capacitor)mustbeplacedclosetotheVCCpinsofTS51221.
TheinductormustbeplacedclosetotheVSWpinsand
connecteddirectlytoCOUTinordertominimizethearea
betweentheVSWpin,theinductor,theCOUTcapacitorandthe
PGNDpins.Thetraceareaandlengthoftheswitchingnodes
VSWandBSTshouldbeminimized.
FortheadjustableoutputvoltageversionoftheTS51221,
feedbackresistorsRBOTandRTOParerequiredforVoutsettings
greaterthan0.9VandshouldbeplacedclosetotheTS51221
inordertokeepthetracesofthesensitivenodeFBasshort
aspossibleandawayfromswitchingsignals.RBOTshouldbe
connectedtotheanaloggroundpin(GND)directlyandshould
neverbeconnectedtothegroundplane.Theanalogground
trace(GND)shouldbeconnectedinonlyonepointtothe
powerground(PGND).Agoodconnectionpointisunderthe
TS51221packagetotheexposedthermalpadandviaswhich
areconnectedtoPGND.RBOTwillbeconnectedtotheVOUT
nodeusingatracethatendsclosetotheactualload.
ForfixedoutputvoltageversionsoftheTS51221,RBOTandRTOP
arenotrequiredandtheFBpinshouldbeconnecteddirectlyto
theVOUT.
TheexposedthermalpadmustbesolderedtothePCBfor
mechanicalreliabilityandtoachievegoodpowerdissipation.
Viasmustbeplacedunderthepadtotransfertheheattothe
groundplane.
Figure 1: TS51221 Application Schematic
Typical Application Schematic



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