[114] Transient Loop Sweeps Outperform Small-Signal Models

Part II: Swept loops in LTspice® provide more accurate and useful results than small-signal models.

[115] Swept Transient Frequency Response for the LLC Converter

Part III: Swept loops in LTspice® can be used for the LLC converter where no small-signal model exists.

[A01] Frequency Response Measurement

Frequency response measurements for a wide range of applications.

[082] Sepic Converter Measurements - Part III Current-Mode Design

Measuring the Sepic converter control transfer function with current-mode control.

[081] Sepic Converter Measurements - Part II Coupled Inductor Design

Control measurements for the Sepic converter with coupled inductors.

[079] Input Impedance Interaction for Board-Mount Boost Converter

How the point-of-load boost converter control characteristics interact strongly with the input capacitor.

[080] Sepic Converter Measurement - Part I Control Transfer Function

Control measurements for the Sepic converter.

[078] Loop Bode Plots and Nyquist Diagrams

Why Nyquist diagrams are not a very practical measurement.

[077] Interpreting Loop Gain Measurements

How to read the critical regions of a loop gain and phase measurement.

[068] Flyback Converter Development Part V - Control and Loop Gain

Flyback converter control and loop gain testing.

[063] Why You Only Need One Injection Isolator

Why only one injection isolator is needed for all measurements.

[062] Input Impedance Measurements and Filter Interactions Part III

What happens when the input filter is poorly designed.

[061] Input Impedance Measurements and Filter Interactions Part II

Measuring input filter output impedance.

[060] Input Impedance Measurements and Filter Interactions Part I

The proper place to apply Middlebrook's stability criteria for input filters.

[059] Input Impedance Measurements and Loop Gains

The relationship between loop gain and input impedance

[058] Audiosusceptibility Measurements and Loop Gains

The relationship between loop gain and audiosusceptibility PSRR

[057] Output Impedance Measurements and Loop Gains

The relationship between loop gain and output impedance

[056] Manual Frequency Response Measurements for Magnetics - Part II

How to improve manual impedance measurements with a good signal source.

[055] Manual Frequency Response Measurements for Magnetics - Part I

How to measure your magnetics properly with a minimum of test equipment.

[051] Forward Converter Design - Part XVII Loop Design and Measurement

Loop design and measurement for the five-output forward converter.

[050] Forward Converter Design - Part XVI Control Modeling

Control predictions and measurement of the five-output forward converter.

[030] Frequency Response Measurement Part 8: More Step-Load Testing

Further examples of why step-load testing will not give you the design information that you need.

[029] Frequency Response Measurement Part 7: Step-Load Testing

Why step-load testing will not give you the design information that you need.

[028] Frequency Response Measurement Part 6: Stability Margins

Concepts of gain margin, phase margin, and relative stability.

[027] Frequency Response Measurement Part 5: Injection Signal Size

Injecting the right signal size is crucial for accurate loop gain measurements.

[026] Frequency Response Measurement Part 4: Loop Measurements

Measuring the open-loop gain of a system while the loop is kept closed for regulation.

[025] Frequency Response Part 3: Important Performance Measurements

Important measurements to make for a power supply design and analysis.

[024] Frequency Response Measurement Part 2: Single-Frequency Measurement

Single-frequency injection and measurement is used to analyze and test power supplies.

[023] Frequency Response Measurement Part I: Wide Band of Frequencies

The needed frequency range of power supply design and analysis is explored.

[009] Is your Input Filter Causing Trouble?

You can analyze your power supply filter quickly and easily with free downloadable software. This allows you to check for filter impedance interactions, attenuation, and proper damping.

Frequency Response