Quasi-resonant flyback controller addresses power design challenges

ON SEMICONDUCTOR NCP1937 quasi-resonant (QR) flyback controller ac-dc device with power factor correction (PFC) utilizes a hybrid digital core architecture enabling higher efficiency, increased flexibility and easier system design implementation. Device incorporates features necessary for building a robust and compact PFC stage in combination with a QR flyback stage while minimizing the number of external components. The quasi-resonant current-mode flyback stage provides a proprietary valley-lockout circuitry, ensuring stable valley switching. Product has wide voltage range spanning 9V to 30 V, plus built-in over-voltage protection, and a skip mode operation which enables higher efficiency in light load conditions.

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