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PQ48033QGA25NNS 데이터시트 PDF




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부품번호 PQ48033QGA25NNS 기능
기능 EMI Characteristics
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PQ48033QGA25NNS 데이터시트, 핀배열, 회로
EMI Characteristics
Application Note 00-08-02 Rev. 04 - 6/25/02
Summary:
This application note will give an overview of electromagnetic interfer-
ence (EMI), the appropriate standards and regulations, how these stan-
dards and regulations relate to dc/dc power modules, suggestions for
external filtering solutions, and suggested layout and grounding prac-
tices.
www.DataSheet4U1.c.o0m Introduction
Designing for electromagnetic compatibility (EMC) is one of the most difficult challenges for electronic system
designers. Almost all-electronic equipment is required to meet one or more EMC standards at the system or
product level. One of the most challenging subsystems when speaking about EMC is the power supply or in this
case the dc/dc power module. All modern dc/dc converters are composed of one or more switching stages
containing both pulsed voltages and currents, which generate a broad noise spectrum resulting in electromag-
netic interference (EMI).
This application note will give an overview of electromagnetic interference (EMI), the different standards and reg-
ulations, how these standards and regulations relate to dc/dc power modules, suggestions for external filtering
solutions, and suggested layout and grounding practices.
The first step in designing systems for EMI compliance is to understand that the different standards and regula-
tions do not directly apply to the dc/dc power module but to the overall system. Regardless, understanding and
minimizing the emissions emanating from the power module is a good beginning to EMI system compliance.
2.0 General Overview
Electromagnetic interference (more commonly known as EMI) refers to how different sets of electronic equipment
interact with each other, usually in a negative manner. The recent advances in semiconductor devices and large-
scale integration has dramatically reduced the size of electronic equipment while increasing the probability for
electromagnetic interference between the different systems and subsystems. Today's electronic designers must
make sure their solutions work in an environment of high EMI. It is not practical to ask new product designers
to test their equipment under all conditions and possible end-user configurations, therefore strict emissions regu-
lations have been established. In the United States the Federal Communications Commission (FCC) regulates the
use of radio and wire communications. Part of its responsibility concerns the control of electromagnetic inter-
ference. The standards for the allowed levels of electromagnetic emissions are outlined in part 15 of the FCC
rules and regulations. These rules apply to almost all-electronic equipment. Under these rules, limits are placed
on the maximum allowable radiated emissions in the frequency range between 30 to 1000 MHz and on the
maximum allowable conducted emissions on the AC power line in the frequency range of 0.450 to 30 MHz.
Radiated Emissions
Radiated emissions refer to interference that is coupled through the air. It is the belief of the FCC that at fre-
quencies below 30 MHz the primary cause of EMI occurs by allowing RF to flow through the AC power lines
where it subsequently radiates into neighboring equipment (conducted emissions).
SynQor - Advancing the Power Curve 888-567-9596 www.synqor.com
Page 1




PQ48033QGA25NNS pdf, 반도체, 판매, 대치품
Application Note 00-08-02 Rev. 04
EMI Characteristics
www.DataSheet4U.com
FCC and CISPR Radiated Emission Limits
50
45
40
35
30
25
10
100
Frequency (MHz)
1000
FCC Class A
CISPR Class A
FCC Class B
CISPR Class B
Figure 2: Radiated emission limits measured at a distance of 10 m [1].
FCC and CISPR Conducted Emission Limits
75
70
65
60
55
50
45
40
0.1
1 10
Frequency (MHz)
FCC Class A
CISPR Class A
FCC Class B
Figure 3: Conducted emission limits [1].
100
CISPR Class B
FCC and CISPR also specify susceptibility emission limits of home electronics equipment and systems. To date,
the FCC does not regulate the susceptibility of electronic equipment; the FCC relies on self-regulation by the
industry. European nations are governed by the standards suggested by CISPR. Any product sold in Europe
must meet these requirements. All SynQor power modules are tested and meet IEC PUBL. 1000-4-3 limits. IEC
1000-4-3 test at field strengths of 3 V/m (normal performance) and 10 V/m (reduced performance). It has been
shown that field strength greater than 2 V/m occurs for approximately 1 % of the time [1].
SynQor - Advancing the Power Curve 888-567-9596 www.synqor.com
Page 4

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PQ48033QGA25NNS 전자부품, 판매, 대치품
Application Note 00-08-02 Rev. 04
EMI Characteristics
Figure 5 shows the physical solution of the SynQor power module. The preferred solution does not have a base-
plate (Cs1 = 0). Capacitance Cs2 is the effective parasitic capacitance between the semiconductors and chas-
sis ground. This capacitance is small relative to the traditional physical implementation, resulting in reduced
common mode emissions.
Semiconductor
Devices
Cs2
www.DataSheet4U.com
FR4 Multilayer Board
Integrated
Magnetics
Cs2 - parasitic capacitance between semiconductor(s) and chassis ground
Figure 5: Physical design of a typical SynQor dc/dc module.
SynQor offers a baseplate option on all of their modules (Figure 6). In this implementation, capacitance Cs2,
which represents the effective capacitance between the semiconductor devices and the baseplate, again, is sig-
nificantly smaller when compared to the traditional design. It is the proximity of the metal "tab" of the semi-
conductor devices to the base plate that contributes to increased coupling (increased Cs2) and increased com-
mon mode currents in the traditional arrangement. Therefore, SynQor's dc/dc power modules generate reduced
levels of common mode emissions.
Semiconductor
Devices
Baseplate
Thermal
Compound
FR4 Multilayer Board
Integrated
Magnetics
Cs1
Baseplate
Cs2
Cs1 - parasitic capacitance between baseplate and chassis
Cs2 - parasitic capacitance between semiconductor and baseplate
Figure 6: Physical design of a SynQor module with the baseplate option.
SynQor - Advancing the Power Curve 888-567-9596 www.synqor.com
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