QPI-8LZ-01【PDF 12/17 页】IC HOT SWAP EMI FILTER 16LGA

Picor Corporation ?picorpower.com

QPI-8

Rev 1.5, Page 12 of 17

QPI-8

QUIETPOWER

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The shield plane under the two converters in Figure 20 should

be one contiguous plane under both. The circuit in Figure 20

is capable of filtering more converters than shown, up to the

maximum current limit of the QPI-8. In Figure 21, a separate

shield plane is required for each converter along with a

separate RY resistor.

The QPI-8 is not designed to be used in parallel with another

QPI-8 to achieve a higher current rating, but it can be used

multiple times within a system design.

Output to Chassis Connection Using the QPI-8

Figure 22 Connecting the converters output ground to chassis through an inductor.

(4)

Figure 23 -Total Noise EMI Plots of Vicors V48B12C250BN, connected as shown in Figure 22

The direct connection of the converters output to the

earth/chassis will degrade the EMI attenuation performance of

the QPI-8. Picor recommends that the connection to the earth

be made through a series inductor, rated to the maximum

output current of the converter, as shown in Figure 22. The

EMI plot shown in Figure 23 is of the same converter as in

Figure 8, but uses an inductor in place of RY and has the

converters output ground connected to the shield plane.

The connection of the shield plane directly to the chassis/earth

will also degrade EMI attenuation by the QPI-8 and is therefore

not recommended.

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