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Ripple injection methods for hysteretic controllers

Posted: 04 Nov 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Power supply? transient response? ripple? hysteretic control scheme? feedback loop?

Power supply applications that expect ultra-fast transient response along with lower ripple are growing today. So, there is an eminent need to use supplies that offer very fast transient responses, at the same time maintaining the required output voltage ripple. Hysteretic-based feedback in the design of a Buck switch mode supply is popular among customers especially for its simple control scheme. Many modifications have been done by various IC manufactures in the hysteretic control scheme, for example, the Constant On Time (COT) scheme used by TI.

Many techniques aim at injecting ripple in the feedback loop while minimising the same in the final output voltage as delivered to the load with a good degree of success.

However, this does adversely affect the transient response of the supply, an aspect often neglected by amateur power supply designers.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Transient Response versus Ripple C An Analysis of Ripple Injection Techniques Used in Hysteretic Controllers".

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