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PQ48033QGAxxNNS Dataheets PDF



Part Number PQ48033QGAxxNNS
Manufacturers Synqor
Logo Synqor
Description EMI Characteristics
Datasheet PQ48033QGAxxNNS DatasheetPQ48033QGAxxNNS Datasheet (PDF)

EMI Characteristics Application Note 00-08-02 Rev. 04 - 6/25/02 Summary: This application note will give an overview of electromagnetic interference (EMI), the appropriate standards and regulations, how these standards and regulations relate to dc/dc power modules, suggestions for external filtering solutions, and suggested layout and grounding practices. www.DataSheet4U.com 1.0 Introduction Designing for electromagnetic compatibility (EMC) is one of the most difficult challenges for electron.

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EMI Characteristics Application Note 00-08-02 Rev. 04 - 6/25/02 Summary: This application note will give an overview of electromagnetic interference (EMI), the appropriate standards and regulations, how these standards and regulations relate to dc/dc power modules, suggestions for external filtering solutions, and suggested layout and grounding practices. www.DataSheet4U.com 1.0 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 electromagnetic interference (EMI). This application note will give an overview of electromagnetic interference (EMI), the different standards and regulations, 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 regulations 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 largescale 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 regulations 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 interference. 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 frequencies 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 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, compliance is the responsibility of the end-product manufacturer. Tables 1 and 2 show the different radiated emissions limits for both Class A and Class B. A true comparison 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. www.DataSheet4U.com 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 .


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