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参数资料
| 型号： | LTC4266IUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件页数： | 20/30页 |
| 文件大小： | 414K |
| 代理商： | LTC4266IUHF#PBF |
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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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相关代理商/技术参数 |
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| LTC4267 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller |
| LTC4267-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator |
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| LTC4267CDHC#PBF | 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND |
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