Evaluating Power Supply Performance with an Oscilloscope: From Switching Loss to Switching Noise

March 9, 2016 Tektronix Experts

MOSFETs in a switch-mode power supply dissipate power while they switch. To keep efficiency high, the switching time needs to be kept short. But short switching time translates into high slew rates, which means high-frequencies. These high frequencies can “escape” from a power supply and cause EMC problems or problems with output noise. If you’ve been struggling to balance these factors in your design, you might be interested in a pair of roughly four-minute videos that one of our senior applications engineers has put together.

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