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QPI-9 Data Sheet Rev. 1.3 Page 3 of 8

Applications Information

The QPI-9 is an EMI filter especially designed for

V•I Chip products, providing conducted common-mode

and differential-mode attenuation from 150 kHz to

30 MHz. Designed for the industrial and military bus

range, the QPI supports the filtering of system boards

using VICOR's V•I Chip technology to the EN55022

class B limit.

The resulting plot in Figure 4 shows the QPI-9 is

to well below the EN55022 Class B Quasi-peak

detection limit.

The plot in Figure 4 was taken using the standard

50/50 µH LISN and measurement conditions, with the

Peak detection mode of the spectrum analyzer, for a

conducted EMI test. The results are compared to the

CISPR22 EN55022 Class B Quasi-peak detection limit and

using MP028F036M12AL & MV036F120M010 with QPI-9

connected, as shown in Figure 3.

Figure 3 – Standard LISN test setup, 100 W load.

Figure 4 – Conducted EMI profile of V•I Chip with QPI-9 with a 100 W load.