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Compensation of a PFC stage driven by the NCP1654/5

Posted: 12 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PFC controller? power factor correction? NCP1654? application note?

Circuits for power factor correction have to shape the line current that is a low frequency signal. Hence, they are in essence extremely slow systems. That is why, the compensation of the PFC loop is generally not considered as a critical step when designing a power supply: "wildly shrink your bandwidth, that's it!". Still however, a PFC stage must be compensated and this unavoidable step should be properly performed for an optimized operation of the downstream converter and a satisfactory power factor. This application note shows how a NCP1654 or NCP1655 driven PFC can be compensated by the means of a systematic method. Reusable for other circuits, this process is practically illustrated through a wide mains, 300W application.

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