Picor Corporation · picorpower.com

QPI-6

Rev 2.6, Page 8 of 13

QPI-6

QUIETPOWER

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Output to Chassis Connection Using the QPI-6

Figure 15 – Connecting the converter’s output ground to chassis through an inductor.

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Figure 16 -Total Noise EMI Plots of PKM 4402NG, connected as shown in Figure 15

The direct connection of the converter’s output to the

earth/chassis will degrade the EMI attenuation performance of

the QPI-6. 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 15. The

EMI plot shown in Figure 16 is of the same converter as in

Figure 11, but uses an inductor in place of RY and has the

converter’s 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-6 and is therefore

not recommended.