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Measuring the Control Loop Response of a Power Supply Using an Oscilloscope
Abstract
Most power supplies and regulators are designed to maintain a constant voltage over a specified current range. To accomplish this goal, 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. Although frequency response analysis may be performed using dedicated equipment, newer oscilloscopes may be used to measure the response of a power supply control loop.
Most power supplies and regulators are designed to maintain a constant voltage over a specified current range. To accomplish this goal, 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. Although frequency response analysis may be performed using dedicated equipment, newer oscilloscopes may be used to measure the response of a power supply control loop.
| Application: | Power |
| Industry: | |
| Author: | Tektronix |
| External Link to complete AppNote/Whitepaper: | |
| https://www.tek.com/en/documents/technical-brief/measuring-the-control-loop-response-of-a-power-supply-using-an-oscilloscope | Published: | 15-01-2024 |
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