Design Center
[A16] Ripple Theorem
Vorpérian’s amazing ripple theorem generates ripple currents and voltages from the small-signal switch model.

[A15] High Frequency Power Transformer Measurement & Modeling
Characterize your magnetics properly to guarantee quality parts.

[A14] Made in China: Land of Opportunity?
The hidden price of outsourcing is an abandonment of valuable IP.

[A13] Power Supply Stress Testing
Useful techniques for accurately determining junction temperatures of your semiconductor devices.

[096] Current-Mode History and Loose Ends Part V – The Correct Modulator Gain
The correct modulator gain is confirmed by experiment. Different analysis results are completely resolved when choosing the right modulator gain.

[A12] Semiconductor Temperature Measurement in a Flyback Power Supply
Useful techniques for accurately determining junction temperatures of your semiconductor devices.

[A11] Gate Drive Design Tips
The right way to drive you power circuit mosfets for safety and ruggedness.

[A09] Analyzing The Sepic Converter
Summarizing the main features of the Sepic control characteristics.

[A08] Six Common Reasons for Power Supply Instability
There are many causes for apparent instability in a controller, not just a lack of phase margin in the loop.

[A06] Core Loss Modeling & Measurement
A core loss modeling paper from Chris Oliver of Micrometals.

[A05] The Digital Power Supply Revolution
The effects of digital control on loop design.

[A04] The Reemergence of Quality
Kevin Parmenter talks about the trade-off between cost saving and quality.

[A03] Modeling Ferrite Core Losses
The Ridley-Nace model improves accuracy over wide range of core usage.

[A02] The Electric Car: What Does the Future Hold?
The Tzero car from ac propulsion set the stage for Tesla and other electric car companies.

[A01] Frequency Response Measurement
Frequency response measurements for a wide range of applications.

[095] Current-Model History and Loose Ends Part IV – Infinite Gain Model
Papers from MIT and others indicate a current loop gain of infinity under all conditions, clearly an impossibility according to Nyquist.

[094] Current-Mode History and Loose Ends Part III – Lee’s Model
Dr. Lee's early papers indicated a current loop crossover approaching infinity at D=0.5, violating Nyquist priciples by a large margin.

[093] Current-Mode History and Loose Ends Part II – Middlebrook’s Model
Dr. Middlebrook's early paper on current mode indicated a current loop crossover above half the switching frequency, violating Nyquist priciples.

[092] Current-Mode History and Loose Ends Part I
Confusion and errors in calculating the current modulator loop gain are resolved in this series.

[091] Core Loss Modeling - Part III Sinewave Versus Triangle Wave Losses
Calculating the difference between sinewave and triangle wave excitation shows that sinewave measurements are sufficient for loss calculations.
