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Manufacturer Part #


NCP1605 Series 20 V 5 mA Power Factor Correction Controller - SOIC-16

Mfr. Name: ON Semiconductor
Standard Pkg:
Product Variant Information section
Date Code: 1932
Product Specification Section
Technical Attributes
Attributes Table
Switching Frequency-Max: 250kHz
Supply Current-Max: 7mA
Supply Voltage-Max: 20V
Power Dissipation: 550mW
Operating Temp Range: -40°C to +125°C
Thermal Resistance: 145°C/W
Storage Temperature Range: -65°C to +150°C
Package Style:  SOIC-16
Mounting Method: Surface Mount
Features & Applications

The NCP1605 is a Enhanced, High Voltage and Efficient Standby Mode, Power Factor Controller.

The NCP1605 is a controller that exhibits near−unity power factor while operating in fixed frequency, Discontinuous Conduction Mode (DCM) or in Critical Conduction Mode (CRM). Housed in a SOIC−16 package, the circuit incorporates all the features necessary for building robust and compact PFC stages, with a minimum of external components. In addition, it integrates the skip cycle capability to lower the standby losses to a minimum.

Key Features:

  • Near−Unity Power Factor
  • Fixed Frequency, Discontinuous Conduction Mode Operation
  • Critical Conduction Mode Achievable in Most Stressful Conditions
  • Lossless High Voltage Current Source for Startup
  • Soft Skip Cycle for Low Power Standby Mode
  • Switching Frequency up to 250 kHz
  • Synchronization Capability
  • Fast Line / Load Transient Compensation
  • Valley Turn On
  • High Drive Capability: −500 mA / +800 mA
  • Signal to Indicate that the PFC is Ready for Operation (“pfcOK” Pin)
  • VCC range: from 10 V to 20 V
  • Follower Boost Operation
  • Two VCC Turn−On Threshold Options:
    • 15 V for NCP1605
    • 10.5 V for NCP1605A
  • This is a Pb−Free Device

Safety Features:

  • Output Under and Overvoltage Protection
  • Brown−Out Detection
  • Soft−Start for Smooth Startup Operation
  • Overcurrent Limitation
  • Zero Current Detection Protecting the PFC stage from Inrushm Currents
  • Thermal Shutdown
  • Latched Off Capability


  • Clean & lossless start-up sequence Less components
  • The best of the 2 modes: DCM to limit the maximum switching frequency and CRM to lower maximum current stress
  • Further reduced losses
  • Suitable for topologies requiring limited input voltage range


  • PC Power Supplies
  • All Off Line Appliances Requiring Power Factor Correction
Pricing Section
Minimum Order:
Multiple Of:
On Order:
Factory Stock:Factory Stock:
Factory Lead Time:
8 Weeks
Web Price
Product Variant Information section