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Home » NEWEST Products » New by Manufacturer » ON Semiconductor » NCP1937 PFC & QR Flyback Controller - ON Semiconductor
NEWEST Products
ON Semiconductor NCP1937 PFC & QR Flyback Controller

ON Semiconductor NCP1937 PFC
& QR Flyback Controller

ON Semiconductor NCP1937 PFC & QR Flyback Controller 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 circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption.

Features
  • <10mW No Load Standby Performance
  • High voltage startup circuit and active input filter capacitor discharge circuitry
  • High voltage line voltage detector
  • Integrated high voltage switch disconnects PFC feedback resistor divider
  • Fault input for severe fault conditions
  • PFC
    • Bi-level line-dependent output voltage
    • Boost diode short-circuit protection
    • Adjustable PFC disable threshold based on output power
  • QR Flyback controller
    • Frequency foldback with minimum frequency clamp
    • Minimum frequency clamp
    • Valley switching operation with valley-lockout
Applications
  • Adapters
  • Combo PFC+QR
Block Diagram
Block Diagram
  • ON Semiconductor