FAN9672/FAN9673 Tips and Tricks APPLICATION NOTE
■FAN967x is multi−channel interleaved continuous− conduction−mode (CCM) power−factor−correction (PFC) controller. It is intrinsically an average−current−mode PWM controller that makes average inductor current track real−time input−voltage waveform. FAN9672 has two gate outputs, and FAN9673 has three, which control three parallel−connected boost converters. By making gate−drive signals in each channel interleaved, it reduces switching ripple of both input current and output voltage.
■Since FAN967x has abundant of functionalities to make PFC pre−regulator (PFC converter) works flawlessly, functional description and design guideline on data sheets [1−2] and another application note [3] were written more commonly, focusing on making the design process easier to follow. They aim at most typical applications: universal input range (90 to 264 Vac) and European input range (180 to 264 Vac) with design equations simplified according to pre−assumed designed values.
■This application note means to explain those functions in terms that are more general. Information here makes readers understand this controller better. Moreover, when one wants to design PFC pre−regulator beyond the limitation set by the pre−assumed designed values, these pieces of information are beneficial for one to play around with this controller.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/8/6 |
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Rev. 1 |
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AND9925/D |
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643 KB |
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