Design Center
[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.
[090] Core Loss Modeling - Part II Incorporating Duty Cycle Effects
Improved formulas for magnetics core loss with duty cycle effects.
[089] Core Loss Modeling - Part I Ridley-Nace Equation
Improved formulas for calculating magnetics core loss.
[088] PSRR and Low-Performance Control Loops
PSRR becomes a major problem with poorly-designed control loops.
