ON Semiconductor Is Now To learn more about onsemi, please visit our website at www.onsemi.com onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba onsemi or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without notice. 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Should Buyer purchase or use onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. High-Voltage, Quasi-Resonant, Controller Featuring Valley Lock-Out Switching NCP1341 www.onsemi.com The NCP1341 is a highly integrated quasi resonant flyback controller suitable for designing highperformance offline power converters. With an integrated active X2 capacitor discharge feature, the NCP1341 can enable noload power consumption below 30 mW. 8 9 The NCP1341 features a proprietary valleylockout circuitry, 1 1 th ensuring stable valley switching. This system works down to the 6 SOIC9 NB SOIC8 NB valley and transitions to frequency foldback mode to reduce switching D SUFFIX D SUFFIX losses. As the load decreases further, the NCP1341 enters quietskip CASE 751BP CASE 751 mode to manage the power delivery while minimizing acoustic noise. The NCP1341 integrates power excursion mode (PEM) to minimize MARKING DIAGRAM transformer size in designs requiring high transient load capability. If transient load capability is not desired, the NCP1340 offers the same 9 performance and features without PEM. 1341xz To help ensure converter ruggedness, the NCP1341 implements ALYW several key protective features such as internal brownout detection, a nondissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and 1 NTCready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the 1341xz = Specific Device Code x = A or B ac line is removed. z = 1, 2, 3, 4 or 5 A = Assembly Location Features L = Wafer Lot Integrated HighVoltage Startup Circuit with Brownout Detection Y = Year Integrated X2 Capacitor Discharge Capability W = Work Week = PbFree Package Wide V Range from 9 V to 28 V CC 28 V V Overvoltage Protection CC PIN CONNECTIONS Abnormal Overcurrent Fault Protection for Winding Short Circuit or 1 Saturation Detection Fault HV Internal Temperature Shutdown FMAX VCC Valley Switching Operation with ValleyLockout for NoiseFree FB DRV ZCD/OPP Operation CS GND Frequency Foldback with 25 kHz Minimum Frequency Clamp for Increased Efficiency at Light Loads 1 FMAX HV Skip Mode with QuietSkip Technology for Highest Performance VCC FB During Light Loads ZCD/OPP DRV Minimized Current Consumption for No Load Power Below 30 mW CS GND Frequency Jittering for Reduced EMI Signature (Top Views) Latching or AutoRecovery TimerBased Overload Protection Adjustable Overpower Protection (OPP) ORDERING INFORMATION Fixed or Adjustable Maximum Frequency Clamp See detailed ordering and shipping information on page 3 of this data sheet. Fault Pin for Severe Fault Conditions, NTC Compatible for OTP (9Pin Version Only) 4 ms SoftStart Timer Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: January, 2021 Rev. 7 NCP1341/D