Introducing MDI's 3090, 3656 and 6681 series DC-DC Converters with advanced MIL-STD-461D, E and F EMI Filtering

by no author specified, Vendor website, Mar 05 2014

Focus:
The three named series of hybrid dc-dc converters were designed to meet the later revisions of MIL-STD-461 EMC spec. These D, E, and F revisions require greater filter attenuation and a different filter topology than EMI filters designed to meet rev. C. After briefly discussing compliance of the named dc-dc converters with MIL-STD-461, DO- 160, and related standards, this application note explains the considerations that influenced the design of the internal EMI filters in these converters. While this app note won’t teach you how to design EMI filters, it offers a useful introduction to the topic and explains the reasons for purchasing hybrid converters with built-in input EMI filters rather than using external filters. It starts with the most basic concepts of EMI, discusses requirements concerning conducted EMI emissions, conducted susceptibility, and radiated emissions and susceptibility for dc-dc converters. Measurement setup requirements are discussed and filter design constraints are explained. Explanations are clear and easy to follow, but there are no diagrams.

What you’ll learn:

• How to understand what criteria influence the design of input EMI filters for hybrid dc-dc converters, particularly to meet MIL-STD-461D/E/F
• How to understand the reasons for selecting hybrid dc-dc converters with built-in EMI filters

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