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IQ040PFQTC30SRS-G

Passive EMI Filter

SynQor Worldwide Headquarters 

Technical

Specification

IQ040PFQTC30

Basic Operation and Features

This module is a multi-stage differential-mode and common-mode

passive EMI filter designed to interface a power source with one

or more SynQor dc-dc converters (or other loads that create EMI).

Each stage of this filter is well damped to avoid resonances and

oscillations, and only X7R multi-layer ceramic capacitors are used.

This InQor EMI filter includes a large bulk capacitor with a series

damping resistor to correct for the unstabilizing effect of a

converter’s negative input resistance. A white paper discussing

this negative input resistance and the need for corrective

damping can be found on the SynQor website (see Input System

Instability application note).

A typical application would place the InQor filter close to the

input of the dc-dc converter. The Input common-mode pin

would be connected to the chassis ground that is common with

the system input line filter or other earthed point used for EMI

measurement. The output common-mode pin would be connected

to the output ground or plane of the power converters with as

low inductance a path as possible. There are no connections to

the metal baseplate, which may also be connected to the chassis

ground if desired.

Do not connect the outputs of multiple InQor filters in parallel.

Connecting filters in this manner may result in slightly unequal

currents to flow in the positive and return paths of each filter.

These unequal currents may cause the internal common-mode

chokes to saturate and thus cause degraded common-mode

rejection performance.

40

0

-40

-80

-120

-160

-200

Differential

Attenuation

Common-mode

Attenuation

-240

1.00E+04

1.00E+05

1.00E+06

Frequency (Hz)

1.00E+07

1.00E+08

Figure 1: Typical Common Mode and Differential Mode Attenuation provied by

the filter as a function of frequency. both input lines are connected to chassis

ground through 50Ω resistors.

Product # IQ040PFQTC30

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-0005086 Rev. B

03/19/09

Page 6

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