NCP1937xxG AWLYWW Combination Power Factor Correction and Quasi- Resonant Flyback Controllers for Adapters NCP1937 www.onsemi.com 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 MARKING DIAGRAM adapter application. 120 HV/X2 PFBHV The PFC stage exhibits nearunity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp. BO/X2 PFBLV The circuit incorporates all the features necessary for building a robust GND PControl PCS/PZCD and compact PFC stage while minimizing the number of external SOIC20 PONOFF PDRV Narrow Body components. QCT QDRV CASE 751BS QCS Fault The quasi resonant current mode flyback stage features a PSTimer VCC proprietary valleylockout circuitry, ensuring stable valley switching. QFB QZCD th This system works down to the 4 valley and toggles to a frequency NCP1937 = Specific Device Code th foldback mode with a minimum frequency clamp beyond the 4 xx = A1, A2, A3, B1, B2, B3, B51, valley to eliminate audible noise. Skip mode operation allows = C1, C4 or C61 excellent efficiency in light load conditions while consuming very low A = Assembly Location WL = Wafer Lot standby power consumption. YY = Year Common General Features WW = Work Week G = PbFree Package Wide V Range from 9 V to 30 V with Builtin Overvoltage CC Protection HighVoltage Startup Circuit and Active Input Filter Capacitor ORDERING INFORMATION Discharge Circuitry for Reduced Standby Power See detailed ordering and shipping information on page 5 of this data sheet. Integrated HighVoltage BrownOut Detector Integrated HighVoltage Switch Disconnects PFC Feedback Resistor Divider to Reduce Standby Power Fault Input for Severe Fault Conditions, NTC FeedForward for Improved Operation across Line and Compatible (Latch and AutoRecovery Options) Load 0.5 A / 0.8 A Source / Sink Gate Drivers Adjustable PFC Disable Threshold Based on Output Power Internal Temperature Shutdown Power Savings Mode Reduces Supply Current QR Flyback Controller Features Consumption to 70 A Enabling Very Low Input Power Valley Switching Operation with ValleyLockout for Applications NoiseFree Operation Frequency Foldback with Minimum Frequency Clamp PFC Controller Features for Highest Performance in Standby Mode Critical Conduction Mode with Constant On Time Minimum Frequency Clamp Eliminates Audible Noise Control (Voltage Mode) and Maximum Frequency Clamp TimerBased Overload Protection (Latched or Accurate Overvoltage Protection AutoRecovery options) BiLevel LineDependent Output Voltage Adjustable Overpower Protection Fast Line / Load Transient Compensation Winding and Output Diode ShortCircuit Protection Boost Diode ShortCircuit Protection 4 ms SoftStart Timer Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: March, 2020 Rev. 6 NCP1937/DN NCP1937 Figure 1. Typical Application Circuit www.onsemi.com 2 L PDRV N L VZCD VCC (Aux) HV/X2 PFBHV PCS/PZCD PFBLV BO/X2 GND PControl PCS/PZCD PCS/PZCD PONOFF PDRV PDRV QCT QDRV QCS Fault QCS PSTimer VCC VCC QFB QZCD QCS NCP1937 VZCD VPSTimer PSM Control