NCP1937: Combination Power Factor Correction & Quasi-Resonant Flyback Controller

Description: This combination IC integrates power factor correc...
  • 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 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 - Lowest no load performance
  • High Voltage Startup Circuit and Active Input Filter Capacitor Discharge Circuitry - Eliminates the need for an external HV startup circuit and X2 resistors.
  • High Voltage Line Voltage Detector - Optimize performance based on 110 v or 220 V ac mains
  • Integrated High Voltage Switch Disconnects PFC Feedback Resistor Divider - Reduces no load standby power
  • Fault Input for Severe Fault Conditions - Enhanced protection capability
  • Bi-Level Line-Dependent Output Voltage - Optimized system with different input voltages
  • Boost Diode Short-Circuit Protection - Enhanced protection features
  • Adjustable PFC Disable Threshold Based on Output Power - Optimized system to improve efficiency
  • Frequency Foldback with Minimum Frequency Clamp - Enhanced efficiency at light and no load
  • Minimum Frequency Clamp - Eliminates audible noise
  • Valley Switching Operation with Valley-Lockout - Noise free operation
  • PFC
  • QR Flyback Controller
  • Applications
  • Adapters
  • Combo PFC+QR
  • End Products
  • All-In-One (AIO) Computers
  • High Power Notebook Adapters
  • Availability and Samples
    NCP1937A1DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937A2DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937A3DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937B1DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):13 to 16
  • Arrow:0
  • Mouser:>1K
  • NCP1937B2DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937B3DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937C1DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937C4DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1937C61DR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Combination Power Factor Correction & Quasi-Resonant Flyback Controller
  • Package Type: SOIC-20 NB
  • Package Case Outline: 751BS
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Specifications
  • PFC Mode: CRM 
  • Frequency Operation: Variable 
  • Control Mode: Current Mode 
  • Topology: Flyback 
  • fSW Typ (kHz): Variable 
  • VCC Max (V): 30 
  • Drive Cap. (mA): 0.5 
  • UVLO (V): Yes 
  • Latch: Yes   
  • UVP: Yes   
  • Inhibition: Yes   
  • Package Type: SOIC-20 NB 
  • ON Semiconductor Full Web Site