Application Note: Measuring the Control Loop Response of a Power Supply Using an Oscilloscope

Most power supplies and regulators are designed to maintain a constant voltage over a specified current range. They are essentially amplifiers with a closed feedback loop. An ideal supply needs to respond quickly and maintain a constant output, but without excessive ringing or oscillation. Control loop measurements help to characterize how a power supply responds to changes in output load conditions.

This application note uses a 5 Series MSO oscilloscope with Option 5-PWR Advanced Power Measurement and Analysis to demonstrate the principles of Bode Plots.

Go Beyond the Expected

Whether you’re debugging power supplies or designing to high-speed digital standards, we’ve elevated our bar so you can elevate yours. Get accurate answers faster and easier.

6 Series B MSO

Ideal for debugging and validating high-speed designs with sampling up to 50 GS/s and the lowest noise in the industry.

  • 15.6-inch HD (1920x1080) capacitive touch display
  • 12-bit vertical resolution; up to 16 bits in High Res mode
  • Available with or without Windows 10 operating system

5 Series MSO

This instrument platform changed the way we think about oscilloscopes. It sets a new standard for performance, analysis, and overall usability.

  • 15.6-inch HD (1920x1080) capacitive touch display
  • 12-bit vertical resolution; up to 16 bits in High Res mode
  • Available with or without Windows 10 operating system

4 Series MSO

Built to handle more signals with great resolution and versatility. Built for tough days and every day.

  • 13.3-inch HD (1920x1080) capacitive touch display
  • 12-bit vertical resolution; up to 16 bits in High Res mode
MDO

Are you interested in learning more about the 4 Series MSO, 5 Series MSO or 6 Series B MSO?