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參數(shù)資料
| 型號(hào)： | QPI-8LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁(yè)數(shù)： | 4/17頁(yè) |
| 文件大?。?/td> | 1498K |
| 描述： | IC HOT SWAP EMI FILTER 16LGA |
| 標(biāo)準(zhǔn)包裝： | 20 |
| 系列： | Picor®, QUIETPOWER® |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | AdvancedTCA |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 6A |
| 電源電壓： | 36 V ~ 76 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | 管件 |
| 其它名稱： | 1102-1092-5 |
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Picor Corporation ?picorpower.com
QPI-8
Rev 1.5, Page 4 of 17
QPI-8
QUIETPOWER
?/DIV>
EMI Management
The more effectively EMI is managed at the source, namely
the power converter, the less EMI attenuation the filter will
have to do. The addition of Y capacitors to the input and
output power nodes of the converter will help to limit the
amount of EMI that will propagate to the input source.
Figure 4 An unfiltered converters response to open-frame
(light blue) and base-plate (purple) EMI configurations.
There are two basic topologies for the connection of the re-
circulating Y capacitors, referred to as open-frame and
base-plate . Figure 4 illustrates how a converter can
favor one topology versus another. The EMI generated by
the base-plate configuration is much greater than that
generated by the open-frame . Selecting the right topology
will greatly reduce the amount of EMI signal that needs to be
filtered.
Figure 2 shows the base-plate topology of re-circulating Y
caps. Here, CY1 to CY4 are connected to each power node of
the dc-dc converter, and then are commoned together on a
copper shield plane created under the converter. The
addition of the copper shield plane helps in the containment
of the radiated EMI, converting it back to conducted EMI and
shunting it back to its source.
The RY resistor, connected between the shield plane and the
QPIs shield pin, provides an impedance that makes the QPIs
common mode noise cancelation signal more effective at
removing the common mode noise that would normally
return to the shield/earth connection. It is important when
laying out the QPI that the RY resistor connects to the QPIs
shield pin before making the connection to earth ground.
In Figure 5, the open-frame topology is shown where the Y
capacitors (CY1 and CY2) re-circulate the EMI signals between
the positive input and output, and the negative input and
output nodes of the power conversion stage.
Figure 5 - Typical 'open-frame" application using a converter with low enable.
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