PQ48015HTA60NNS EMI Characteristics Datasheet

PQ48015HTA60NNS Datasheet, PDF, Equivalent


Part Number

PQ48015HTA60NNS

Description

EMI Characteristics

Manufacture

Synqor

Total Page 14 Pages
Datasheet
Download PQ48015HTA60NNS Datasheet


PQ48015HTA60NNS
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

PQ48015HTA60NNS
Application Note 00-08-02 Rev. 04
EMI Characteristics
All electronic equipment that generates pulses of any kind in excess of 10,000 pulses per second (> 10 kHz)
is subjected to these regulations. Electronic equipment is divided into two classes according to the FCC:
Class A: Electronic equipment that is marked for use in a commercial, industrial, or
business environment [2].
Class B: Electronic equipment that is marketed for use in a residential environment,
notwithstanding its use in a commercial, industrial, or business environment [2].
Class B equipment is more likely to be located in close proximity to radio and television receivers, therefore,
the emissions limits for these devices is more restrictive relative to Class A. As it was stated before, compli-
ance is the responsibility of the end-product manufacturer.
www.DataSheet4U.com
Tables 1 and 2 show the different radiated emissions limits for both Class A and Class B. A true compari-
son of these limits cannot be made unless they are compared at the same distance. The Class A limits can
be extrapolated to a distance of 3-m by using a 1/r extrapolation where r is the distance between the source
and the receiving equipment. In general, Class B limits are more restrictive by a factor of 3 (~ 10 dB) as
shown in Figure 1.
Frequency
(MHz)
30 - 88
88 - 216
216 - 1000
Measuring
Distance (m)
30
30
30
Field Strength
(µV/m)
30
50
70
Table 1: FCC Class A Radiated Emmissions Limits [2].
Frequency
(MHz)
30 - 88
88 - 216
216 - 1000
Measuring
Distance (m)
3
3
3
Field Strength
(µV/m)
100
150
200
Table 2: FCC Class B Radiated Emmissions Limits [2].
SynQor - Advancing the Power Curve 888-567-9596 www.synqor.com
Page 2


Features EMI Characteristics Application Note 00- 08-02 Rev. 04 - 6/25/02 Summary: This a pplication note will give an overview o f electromagnetic interference (EMI), t he appropriate standards and regulation s, how these standards and regulations relate to dc/dc power modules, suggesti ons for external filtering solutions, a nd suggested layout and grounding pract ices. www.DataSheet4U1.c.o0m Introducti on Designing for electromagnetic compat ibility (EMC) is one of the most diffic ult challenges for electronic system de signers. Almost all-electronic equipmen t is required to meet one or more EMC s tandards at the system or product level . One of the most challenging subsystem s 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 stag es containing both pulsed voltages and currents, which generate a broad noise spectrum resulting in electromagnetic i nterference (EMI). This application note will give an overview .
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