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Step-down DC/DC converter input ripple and noise

Posted: 15 Jul 2008     Print Version  Bookmark and Share

Keywords:DC/DC converter  filter methods  high frequency  step-down converter 

This application note discusses the proper methods for measuring input and output noise of a high frequency DC/DC converter. Without proper measurement techniques, the high frequency noise component can easily be overestimated. When necessary, simple methods are available to reduce input noise and the impact it may have on other devices.

When a step-down converter shares a common input voltage with other devices, the input noise generated by the step-down converter may be sufficient to cause interference with the other devices. Simple filter methods can be used to reduce the input noise, and simple models can be developed characterise the circuit. Two circuit models—one for the fundamental switching frequency ripple component and one for the high frequency noise—simplify the analyses. In most cases, a ceramic bypass capacitor placed close to devices that share the common input voltage is sufficient. A ferrite bead placed between the converter input and other devices powered from the same source attenuates the converter input noise.

View the PDF document for more information.

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