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Special Contributor: Timothy Hegarty

Timothy Hegarty is a principal applications engineer for the National Semiconductor design center in Tucson, Ariz. He received the B.E.(Elec.) and M.Eng.Sc degrees in Electrical Engineering from University College Cork, Ireland in 1995 and 1997, respectively. Prior to joining National, he worked for Artesyn Technologies designing isolated board-mounted brick converters. His areas of interest are integrated PWM switching regulators and controllers, LDOs, references, hot-swap controllers, renewable energy systems, and system-level simulation of same. Tim can be reached at Tim.Hegarty@ti.com.
Articles written by Timothy Hegarty in How2Power Today:
02/14/25Current Mode-Controlled DC-DC Regulators (Part 3): CC-CV Regulation
12/15/24Current Mode-Controlled DC-DC Regulators (Part 2): Loop Compensation And Load Transient Performance
11/15/24Current Mode-Controlled DC-DC Regulators (Part 1): A Review Of Small-Signal Behavior
06/15/24How Active EMI Filter ICs Reduce Common-Mode Emissions In Single- And Three-Phase Applications (Part 4): Loop-Gain Analysis
03/15/24How Active EMI Filter ICs Reduce Common-Mode Emissions In Single- And Three-Phase Applications (Part 3): Modeling Nanocrystalline Chokes
02/15/24How Active EMI Filter ICs Reduce Common-Mode Emissions in Single- And Three-Phase Applications (Part 2): Modeling Ferrite Chokes
11/15/23How Active EMI Filter ICs Reduce Common-Mode Emissions In Single- And Three-Phase Applications (Part 1): An Overview
11/15/22A Guide To Power Electronics Design For Off-Battery Automotive (Part 4): DC-DC Conversion From 400 V
10/15/22A Guide To Power Electronics Design For Off-Battery Automotive (Part 3): DC-DC Conversion From 48 V
06/15/22A Guide To Power Electronics Design For Off-Battery Automotive (Part 2): DC-DC Conversion From 12 V
05/13/22A Guide To Power Electronics Design For Off-Battery Automotive (Part 1): EMC And Line Transient Requirements
07/15/21The Engineer’s Guide To EMI In DC-DC Converters (Part 18): Advanced Spread-Spectrum Techniques
04/15/21The Engineer’s Guide To EMI In DC-DC Converters (Part 17): Active And Hybrid Filter Circuits
12/15/20The Engineer’s Guide To EMI In DC-DC Converters (Part 16): Common-Mode Input Filter Design
10/15/20The Engineer’s Guide To EMI In DC-DC Converters (Part 15): Differential-Mode Input Filter Design
08/14/20The Engineer’s Guide To EMI In DC-DC Converters (Part 14): Behavioral Noise Modeling
06/15/20The Engineer’s Guide To EMI In DC-DC Converters (Part 13): Predicting the Common-Mode Conducted Noise Spectrum
04/15/20The Engineer’s Guide To EMI In DC-DC Converters (Part 12): Predicting The Differential-Mode Conducted Noise Spectrum
01/15/20The Engineer’s Guide To EMI In DC-DC Converters (Part 11): Input Filter Impact On Dynamic Performance
11/15/19The Engineer’s Guide To EMI In DC-DC Converters (Part 10): Input Filter Impact on Stability
08/15/19The Engineer’s Guide To EMI In DC-DC Converters (Part 9): Spread-Spectrum Modulation
02/15/19The Engineer’s Guide To EMI In DC-DC Converters (Part 8): Common-Mode Noise Mitigation In Isolated Designs
12/18/18The Engineer’s Guide To EMI In DC-DC Converters (Part 7): Common-Mode Noise Of A Flyback
09/14/18The Engineer’s Guide To EMI In DC-DC Converters (Part 6): Mitigation Techniques Using Discrete FET Designs
06/15/18The Engineer’s Guide To EMI In DC-DC Converters (Part 5): Mitigation Techniques Using Integrated FET Designs
04/15/18The Engineer’s Guide To EMI In DC-DC Converters (Part 4): Radiated Emissions
03/21/18The Engineer’s Guide To EMI In DC-DC Converters (Part 3): Understanding Power Stage Parasitics
01/15/18The Engineer’s Guide To EMI In DC-DC Converters (Part 2): Noise Propagation And Filtering
12/15/17The Engineer’s Guide To EMI In DC-DC Converters (Part 1): Standards Requirements And Measurement Techniques
01/16/17Automotive Front-End Buck-Boost Regulator Actively Filters Voltage Disturbances
09/15/16Multi-Output Fly-Buck Regulator Offers Wide VIN, Isolation And Low EMI
03/15/16Vertically Stacked MOSFETs And Other Tricks For Building A High-Density 30-A Point-of-Load Regulator
09/15/15Optimizing The Efficiency Of The Four-Switch Buck-Boost Converter
03/13/15Streamlining Synchronous Buck-Boost Converter Design
07/15/14Current-Mode Control Stability Analysis For DC-DC Converters (Part 2)
06/13/14Current-Mode Control Stability Analysis For DC-DC Converters (Part 1)
11/15/13Inductor DCR Current Sensing With Temperature Compensation: An Accurate, Lossless Approach For POL Regulators
03/30/11Paralleling Electrolytic and Ceramic Capacitors Perks Up POL Transient Response
08/19/10SIMPLIS Simulation Tames Analysis of Stability, Transient Response, and Startup For DC-DC Converters

 
 
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