Switch Mode Power Supply Measurements and Analysis

Learn how to use an oscilloscope to debug your power supply!

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Keysight's Johnnie Hancock teaches how to use a digital storage oscilloscope or mixed signal oscilloscope to debug, characterize, and analyze your switching power supply. Learn basic tips and techniques for measuring, probing, and analyzing your designs.

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Agenda:

Power supply basics 1:35 linear power supplies vs switch mode power supplies

Switching power supply measurements overview 2:57 Switching power supply trends 3:57

Probe Deskew 4:36

Power supply measurments -input line measurements and analysis 5:40 --Power quality 6:08 --Current harmonics 10:20 --Inrush current 12:20

-switching device analysis 13:40 --Switching losses 14:03 --Switching Phases 16:30 --Power Losses and Energy Losses 17:17 --Rds(on) 19:15 --Conduction and Toff Losses 21:02 --Vconduction measurement limitations 21:51 --Slew Rate 24:26 --Modulation 26:10

-Design Trade-offs 28:25

-output measurements 26:25 --Output Ripple 29:43 ---Probing Limitations & techniques 31:15 --Turn on time & turn off time 37:05 --Transient Response Analysis 38:12 --Efficiency 39:42 --Power Supply Rejection Ration (PSRR) 40:45

Wrap up & review 46:36 Recommended probes & commonly used probes 47:27 Additional technical resources 49:23

Q&A 49:46

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Music by Lou Leaves the Room ... https://www.youtube.com/watch?v=VLzcV9Sxt5Q