Dear  Electronics Marketer,

Do you ever wonder if your ad is working? We can help answer that question. All full-page advertisers in the March issue of Power Electronics Technology will receive the results of our Ad Perception  Study by Readex.

Selling is a multi-step process rather than a single event. A successful ad affects the first few steps of the process, such as making contact, generating interest and providing information. With a limited budget to spend on advertising, it makes sense to select a publication like Power Electronics Technology that delivers your sales message to the most qualified audience of design engineers. 

The study you receive will help you gauge how well your ad jump-starts the selling process.  A good ad attracts attention and must be seen before it can do anything else. Once contact is made, an effective ad draws readers into the copy, inviting them to go beyond the illustration and headline. Furthermore, a successful ad prompts response by generating interest, creating a favorable impression, propelling readers to take action.

Participating in this FREE Ad Perception Study will provide feedback by helping you not only to answer the question, "how well is my ad working?" but also, "how can it be improved?"

We receive between 80-100 respondents and as a participating advertiser, you'll receive a report with the results in an easy-to-understand format by May. The company that scores the highest in readership will receive a FREE copy of the just released Power Electrics Technology DVD. This groundbreaking DVD provides the compete collection of articles beginning with our launch in 1975 in a fully searchable database.

With all the money you spend on advertising it just makes sense to be sure that the ad you are using is effective in receiving the results you want. Please take a look at the enclosed lineup for March and call me to assure a place in this issue and receive your free study and chance to win the Power Electronics Technology DVD.

Best Regards,

Judy Miller
Associate Publisher
212-204-4246

Cover Story: CAD/CAE
When Is A 22- µ F Capacitor Not 22 µ F?
The answer: often. Parasitics are a chronic driver of performance and can be painful to deal with especially when you don't realize they are in fact impacting your circuit operation. In this article, the authors investigate the effects of dc bias on capacitors in a high-frequency, stepdown dc-dc converter and present a Spice capacitor model that accounts for dc bias.

Power Semiconductors
Thermal Analysis for Power MOSFET in a DC-DC Power Management Application
Designers and users of MOSFETs need dedicated software that utilizes powerful modeling and simulation capabilities, but is not too complex to use. Existing tools either suffer from deficiencies in their capabilities or from a level of complexity that limits their use to experts. In this article, the author discusses a free web-based thermal analysis tool called ThermaSim that makes fast and accurate thermal modeling of the company's MOSFETs available to all engineers. The author also presents a practical design example in which thermal simulation results are compared with actual measurements.

Power Management
Bringing Digital Power Design to the Analog Engineer with LabVIEW FPGA
The PXI platform with its 3U Eurocard format has managed to accommodate digital multimeters and other instruments but has struggled to meet the requirements of programmable power supplies because of its constraints on size, power and cooling. However, the application of switch-mode power supply technology using digital control can overcome these problems. In this article, the authors describe the development of a dual-stage switcher/linear supply with the power and precision needed in PXI applications. The authors also discuss how an analog power supply designer can use the LabVIEW graphical programming language and its FPGA programming capability to implement the digital control required in this design.

Power Systems/Thermal Management: Flybacks Charge Xenon Flash Capacitors
As digital still cameras and mobile phone cameras evolve to higher performance, they're requiring Xenon photoflash bulbs for improved lighting. These bulbs require specialized circuitry to charge the high-voltage capacitor that excites the bulb. Although that circuitry can be implemented using discrete components, ICs can provide a more compact and efficient design. In this article, the authors analyze the performance of one such IC, which implements a flyback converter with p eak-current-limit switching.

Test Equipment:
Waveform Scanning Techniques Solve Power System Design Challenges
Oscilloscope-based measurement techniques developed during the past year make the task of troubleshooting power supply designs systematic and precise. In this article, the author describes five powerful techniques for rapidly characterizing and debugging switch-mode power supply designs. Five real-world engineering challenges are outlined and a practical solution for each is provided and illustrated by images captured live from actual power circuits.

Website Exclusive: Special Section on Power Over Ethernet
Optimizing Efficiency to Deliver Maximize Power to the PD
Under the current IEEE 802.3af standard for Power Over Ethernet (PoE), powered devices (PDs) are limited to a maximum of 12.95 W per port. However, since that power is delivered at 48 V, there will be losses incurred in stepping down this voltage to the voltages required by PD-side circuitry. In this article, the author discusses techniques for minimizing those losses to enable maximum power delivery to the peripheral.

Power Transformer Design for Power Over Ethernet (PoE) Applications
A key element of the IEEE802.3af power over Ethernet standard is that the power delivery must be isolated on the powered device (PD) side. This isolation requires the use of an isolated power topology within the PD. The most cost effective power topology to provide this isolation with acceptable efficiency is the continuous-mode flyback converter. In this article, the author reviews aspects of the PoE standard and the flyback topology and describes a detailed design procedure for the flyback transformer.

Imagine having 30 years of Power Electronics Technology magazine at your fingertips. Now you can in one DVD!
Presenting the first-ever, historical look back at the last thirty years in the power electronics industry. This ground breaking DVD is a searchable database of articles and issue covers dating back to the launch of our magazine in 1975, then called Solid-State Power Conversion. Designed as a research tool for electronics engineers, the DVD offers you the evolution of the industry at your fingertips! Call your sales rep for more info.

Sponsored by
National Semiconductor

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