參數(shù)資料
型號(hào)： LTC4266IUHF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 20/30頁(yè)
文件大?。?/td> 414K
代理商： LTC4266IUHF#TRPBF
LTC4266
4266fa
U1
LTC4266
PORTS A THROUGH D
SENSE1
SENSE2
SENSE3
SENSE4
VEE
VIA
4266 F20
BY KEEPING THESE COPPER FILLS SEPARATE ON
THE SURFACE, MUTUAL RESISTANCE BETWEEN
PORTS A-D AND E-H IS ELIMINATED
THIS TRACE PROVIDES VEE TO U1
BUT ALSO ACTS AS A KELVIN
SENSE LINE FOR PORTS A-D
VEE COPPER FILL ON SURFACE LAYER
VEE PLANE ON INNER LAYER
U2
LTC4266
PORTS E THROUGH H
SENSE1
SENSE2
SENSE3
SENSE4
VEE
RSENSE
RETURN TO
VEE POWER SUPPLY
Figure20.LayoutStrategytoReduceMutualResistance
ApplicAtions inForMAtion
Figure21.GoodPCBLayoutExample
4266 F21
PORT A RSENSE
PORT B RSENSE
FOUR LARGE VIAS
TO VEE PLANE
PIN 1
U1
THE PADDLE IS
CONNECTED TO
VEE PINS
KELVIN SENSE TRACE CONNECTS U1
TO VEE THROUGH THE VIAS ON THE RIGHT
EDGE OF VEE PLANE (ON SOME INNER LAYER)
VIAS TO SOURCE PIN OF
THE PORT D MOSFET
LOCATED ON THE OPPOSITE
SIDE OF THE BOARD
HOLE IN VEE PLANE
PORT C RSENSE
PORT D RSENSE
connectstotheVEEplanewithavia.CurrentsfromtheU1
sub-circuitareeffectivelyisolatedfromtheU2sub-circuit,
reducingthelayoutproblemdownto4-portchunks;this
arrangementcanbeexpandedforanynumberofports.
Figure21showsanexampleofgood4-portlayout.Each
0.25Ωsenseresistorconsistsoffour1Ωresistorsinparal-
lel.Thefourgroupsofresistorsarearrangedtominimize
theoverlapintheircurrentflows,whichminimizesmutual
resistance.Thehorizontalslitscutinthecopperhelpto
keepthecurrentsseparate.Widecopperpathsconnect
eachgroupofresistorstotheviasatthecenter,sothe
resistanceisverylow.
Properconnectionofthesenselineisalsoimportant.In
Figure21,U1isnotconnecteddirectlytotheVEEplane
but is connected instead to a Kelvin sense trace that
leadstothesenseresistorarray.Similarly,theviaatthe
centerofthesenseresistorarrayhasamatchinghole
intheVEEplane.Thisarrangementpreventsthemutual
resistance of the four large vias from influencing the
currentmeasurements.
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