DATA SHEET www.
onsemi.
com Combination Power Factor Correction and QuasiResonant Flyback Controllers for Adapters NCP1937 This combination IC integrates power factor correction (PFC) and quasi−resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application.
The PFC stage exhibits near−unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp.
The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components.
The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circ...

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