Business | Publications | News-Spot | Mar 10, 2017

RECOM Adds Magnetics Chapter to the New Edition of the DC/DC Book of Knowledge

The new edition of the RECOM DC/DC Book of Knowledge has been released, with an additional chapter on magnetics. More than 1,000 online copies have been downloaded by engineers worldwide, in the first few weeks. This shows how valuable this source of in-depth practical power design information is to the power supply community.

The author, Steve Roberts, says: “I am overwhelmed to hear that the new book of knowledge has been so well accepted in the industrial and educational communities. This makes all the hard work in writing the additional chapter worthwhile.”

About the New Chapter on Magnetics:

The new edition features an additional chapter on magnetics to cover the fundamentals of inductors and transformers. The chapter begins with terminology, core saturation, air-gapped inductors, core geometry, core losses, the skin effect and proximity effect. Worked examples of buck and boost DC/DC converter designs show how to correctly dimension the magnetic components and how to calculate the losses in the magnetic core and switching elements. The section continues with DC/DC transformer design, showing how to specify Royer push-pull, forward and flyback transformers - again with worked examples to demonstrate how to calculate the dimensions, turn ratios, losses and duty cycle limits for these topologies. For flyback transformers, the gap length and bobbin dimension calculations are also explained. The effects of leakage flux, leakage inductance and leakage capacitance are discussed and winding techniques to reduce these effects are explored. The chapter concludes with a short discussion on designing for low EMI and adequate internal core temperature safety margins.

While a single chapter cannot cover all aspects of inductor and transformer component design, it offers a useful introduction to the fundamentals of magnetics and the worked examples show how the theory can be put into practice.

Since the original publication in December 2014, more than 15,000 copies of the RECOM DC/DC Book of Knowledge have been distributed globally. Hard copies can be bought at Digi-Key and Chip1Stop. Free PDF versions are available in English, German, Chinese and Japanese at

RECOM Power GmbH:

RECOM Power GmbH supplies a full range of DC/DC and AC/DC converters in every power class up to 480 watts alongside switching regulators and LED drivers in a wide selection of designs. Innovations such as the company’s R-78 switching regulators have become industry standard.
The headquarters in Gmunden, Austria, includes a state-of-the-art logistics centre and laboratory wing. RECOM has a worldwide distribution network to deliver the company’s products to customers worldwide. The RECOM name has become synonymous with high quality, responsibility, innovation and excellent customer service.


Samsung LED Pushes Efficiency of Mid-power Packages to Higher Levels

Samsung LED Pushes Efficiency of Mid-power Packages to Higher Levels Samsung Electronics has announced that it has made an important upgrade in the luminous efficacy of its mid-power LED package. The LM301B was introduced to the market with the industry’s highest light efficacy among mid-power LED packages in 2017. Now, it has enhanced the efficacy considerably ... Read more »


LED Patent Lawsuit

Tridonic initiated patent lawsuits against telecommunication retailer S-KON eKontor24 GmbH. Although District Court Munich I affirmed Tridonic’s arguments, parties agreed on a settlement for reasons of legal certainty and prompt settlement of the dispute. Read more »


Proof Your Blue Light Hazard Risk: Stray Light Corrected CAS 140D

Proof Your Blue Light Hazard Risk: Stray Light Corrected CAS 140D With the stray light corrected CAS 140D Instrument Systems – as a technical pioneer – is the first to offer an array spectrometer that can reliably assess the blue light hazard from light sources within the prescribed limiting values. Hitherto only double monochromators were recommended for this ... Read more »


Edison Opto Unveils Two Novel-Designed Products in EdiPower Series

Edison Opto Unveils Two Novel-Designed Products in EdiPower Series Edison Opto, a global LED lighting manufacturer, unveils two new products in EdiPower Series for broad lighting applications. First, the Tunable Series with superior CRI of 95 supports two output channels to enable two dimming options to dim LED lighting without a brightness drop. In addition, the ... Read more »


High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »