Make Sure Your DC/DC Converter Supports Changing EMC Emissions Standards

(Image source: Polytron Devices)

Engineers have an obligation to minimize radiated EMC emissions in their designs. Not only must they diligently prevent the signals from interfering with other components in the system, they must also make sure the signals do not affect other equipment. International standards have long regulated emissions for power supplies used in IT and telecom equipment and related electronics.

For most of this decade, EN 55022 has defined EMC requirements for information technology equipment (ITE) that operates with a rated supply voltage up to 600 V. Because TVs, set-top boxes, and audio and video equipment have evolved to the point that they share many similarities with ITE, the European Committee for Electrotechnical Standardization (CENELEC) created EN 55032 to unify the standards pertaining to the equipment.

EN 55032 became mandatory in March of 2017. As you evaluate a DC/DC converter, the datasheet may indicate that the unit meets EN 55032 requirements, but manufacturers of products that were sold as EN 55022-compliant prior to that date must also prove EN 55032 compliance. However, if the datasheet indicates EN 55022 compliance, the unit may also comply to EN 55032. In order to use an EN 55022-compliant DC/DC converter in your design, check with the manufacturer to make sure they updated their CE Declaration of Conformity to show the product meets EN 55032 requirements.

(Image source: Polytron Devices)

One good example of a proven DC/DC converter that’s appropriate for present-day ITE equipment applications is Polytron Devices’ LWB60 Series. These single- and dual-output, isolated 60-watt DC/DC converters feature a wide 4:1 input range and come in a low-profile 1 x 2 x 0.4 inch package desirable for space-constrained designs typical of today’s ITE equipment, while their six-sided continuous metal shield minimizes conducted and radiated noise. Originally offered as EN 55022 Class A compliant, the series also satisfies the new EN 55032 requirements. Polytron Devices self-reports a CE Declaration of Conformity for this series based on compliance to RoHS guidelines, low voltage directives, and EMC standards including EN 55032. The LWB60 Series also meets all UL 60950-1, EN 60950-1, and IEC60950-1 requirements. Additional characteristics include:

  • Efficiency between 90 and 92 percent
  • Input to output isolation voltage: 1600 VDC
  • Isolation resistance: 500 VDC, 1 GΩ
  • Isolation capacitance: 2200 pF
  • Switching frequency: 275 kHz, typ.

As international regulators amend standards to keep pace with technology advances, the DC/DC converter vendor you rely on should stay current with the technology and regulations too. Polytron Devices continually strives to make sure its power products conform to the latest regulations in order to support technology trends around the world.

About this author

Image of Sheri Lynn (Daburn)

Sheri Lynn, Director of sales for the power supply division of Daburn Electronics, has been with the company for 1.5 years. Prior to that, she was the International Sales manager of Polytron Devices, a leading manufacturer of Power Supplies and DC/DC Converters. Sheri has a science background with a BS degree from Rutgers University and over 29 years of power supply experience. She has worked her way up in varying roles including assembly, technical sales assistant, assistant marketing manager, technical writer and international sales manager. When not finding solutions to world wide power supply requirements, her free time is spent finding solutions to life’s daily issues as well as listening to music, swimming, trying out new restaurants, and laughing with friends and family.

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