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Why <150W PFC stages use BCM boost PFC and not CCM boost PFC

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treez

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Please confirm that the reason that most <150W Offline Boost PFC designs are done with Boundary conduction mode (BCM) PFC controllers rather than continuous mode (CCM) boost PFC controllers is because the BCM controllers more easily facilitate a faster transient response of the boost PFC stage......and yet still slow enough voltage feedback loop to get a good power factor.
(aside from the obvious advantage of BCM vs CCM which is the lack of reverse recovery in the boost diode)
Its noteable, that CCM PFC stages can be done with a plain inductor, rather than the BCM boost inductors which need the extra winding for the zero cross detection (to tell when the inductor has discharged)......and yet you don’t see CCM PFC stages being used below 150W... in spite of the potentially cheaper inductor......which could even be offtheshelf. A BCM boost inductor must be a more expensive custom wound part.
 

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