onsemi NCP1655ADR2G

The NCP1655 is an innovative multimode power factor controller. The circuit naturally transitions from one operation mode to another depending the switching period duration so that the efficiency is optimized over the line/load range. In very−light−load conditions, the circuit can enter the soft−SKIP mode for minimized losses. Housed in a SO−9 package, the circuit further incorporates the features necessary for robust and compact PFC stages, with few external components.

• Multimode Operation for Optimized Operation over the Line/Load Range:
  • Continuous Conduction Mode (CCM) in Heavy−Load Conditions
  • Frequency−Clamped Critical Conduction Mode (FCCrM) in Medium− and Light−Load Conditions
  • FCCrM: Critical Conduction Mode (CrM) when the CrM Switching Frequency is Lower than 130 kHz, Discontinuous Conduction Mode (DCM) at 130 kHz Otherwise
  • DCM Frequency Reduction in Light Load Conditions
  • Minimum DCM Frequency Forced above 25 kHz
  • Valley Turn−On in FCCrM
  • Soft−SKIP Mode in Very Light Load Conditions
• Firm Control of the Switching Frequency between 25 kHz and 130 kHz
• VS High−Voltage Line Sensing Pin: Reduced External Compoments Count and Minimized Leakage Current Compatible to Most Severe Standby Specifications (<30 μA @ 400 V)
• Internal Compensation of the Regulation Loop
• Fast Line / Load Transient Compensation (Dynamic Response Enhancer)
• Large VCC Operating Range (9.5 V to 35 V)
• Line Range Detection
• pfcOK Signal For Enabling/Disabling the Downstream Converter
• Jittering for Easing EMI Filtering
• Soft− and Fast−Overvoltage Protection
• Brown−Out Detection
• 2−Level Over Current Detection
• Bulk Under−Voltage Detection
• Thermal Shutdown

• PC Power Supplies
• All Off−Line Appliances Requiring Power Factor Correction