NCP1611: Power Factor Controller, Enhanced, High Efficiency

The NCP1611 is active power factor corrected (PFC) controller specifically designed for use as a boost preconverter in ac-dc adapters, flat TVs, lighting ballasts and other medium powered offline applications. The controller is based on an innovative Current Controlled Frequency Foldback(CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1611 linearly reduces the frequency down to about 20 kHz when the current is at a null. CCFF maximizes the efficiency at both nominal and light load. In particular, the standby losses are reduced to a minimum. The controller features a robust suite of protection features to properly handle an array of power supply operating and fault conditions.

Features
  • Critical Conduction mode with current controlled frequency foldback
  • Dynamic Response Enhancer
  • Soft Overvoltage Protection (S-OVP)
  • -500 mA/+800 mA Drive Capability
  • Valley Turn On
  • Wide Vcc Range of 9.5-35V
  • Two Vcc Startup Versions: 10.5V (A) and 17V (B)
  • AC Line Brownout Detection
  • Saturated Inductor and shorted boost or bypass protection
  • Open Pin Protection including Ground
  • Undervoltage and Fast Over voltage protection
  • Near Unity Power Factor
  • Cycle-by-cycle current protection
Benefits
  • Optimizes conversion efficiency across load range
  • Improved transient response for line and load steps
  • Reduces accoustic noise and stress in the even of an overvoltage fault
  • High drive to support wide range of FETS and power levels
  • Improved efficiency and reduced EMI generation
  • Easy to Bias even at light load and high line conditions
  • B version allows smaller Vcc capacitor and faster startup in self biased applications
  • Protect boost stage from fault conditions
  • Enhances safe operating monitoring without extra components
  • Enhanced fault handling
  • Robust safety handling
Applications
  • Offline Power Supplies
  • Lighting Ballasts
End Products
  • Flat TVs
  • All-in-one Computers
  • High Powered Adapters
  • LED Lighting Power Supplies and Drivers
  • Dimmable Fluorescent Ballasts
  • LED Lighting
Design & Development Tools (1)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1611 Design WorksheetNCP1611 DWS.XLS (2518.0kB)0
Application Notes (3)
Document TitleDocument ID/SizeRevisionRevision Date
5 Key Steps to Design a Compact, High-Efficiency PFC Stage using the NCP1611AND9062/D (263.0kB)1
NCP1611/NCP1612 Tips and TricksAND9077/D (557.0kB)2
Safety Tests on a NCP1611-Based PFC StageAND9064/D (1363.0kB)1
Evaluation Board Documents (5)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1611GEVB Bill of Materials ROHS CompliantNCP1611GEVB_BOM_ROHS.PDF (76.0kB)3
NCP1611GEVB Evaluation Board User's ManualEVBUM2049/D (1476.0kB)4
NCP1611GEVB Gerber Layout Files (Zip Format)NCP1611GEVB_GERBER.ZIP (46.0kB)0
NCP1611GEVB SchematicNCP1611GEVB_SCHEMATIC.PDF (67.0kB)2
NCP1611GEVB Test ProcedureNCP1611GEVB_TEST_PROCEDURE.PDF (164.0kB)1
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Enhanced, High Efficiency Power Factor ControllerNCP1611/D (807kB)4
Package Drawings (1)
Document TitleDocument ID/SizeRevision
SOIC-8 Narrow Body751-07 (62.6kB)AK
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1611GEVBActivePb-free160 W Low Profile PFC Evaluation Board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1611ADR2GActivePb-free Halide freeSOIC-8751-073Tape and Reel2500$0.37
NCP1611BDR2GActivePb-free Halide freeSOIC-8751-073Tape and Reel2500$0.37
Specifications
ProductPFC ModeFrequency OperationControl ModeTopologyfSW Typ (kHz)VCC Max (V)Drive Cap. (mA)UVLO (V)LatchUVPInhibition
NCP1611ADR2GCRMVariableCurrent ModeStep-UpVariable35500 / 8009NoYesYes
NCP1611BDR2GCRMVariableCurrent ModeStep-UpVariable35500 / 8009NoYesYes
Enhanced, High Efficiency Power Factor Controller (807kB) NCP1611
NCP1611 Design Worksheet NCP1611
5 Key Steps to Design a Compact, High-Efficiency PFC Stage using the NCP1611 NCP1611
NCP1611/NCP1612 Tips and Tricks NCP1612
Safety Tests on a NCP1611-Based PFC Stage NCP1611
NCP1611GEVB BOM ROHS NCP1611GEVB
EVBUM2049/D - 1476 NCP1611GEVB
NCP1611GEVB GERBER NCP1611GEVB
NCP1611GEVB SCHEMATIC NCP1611GEVB
NCP1611GEVB TEST PROCEDURE NCP1611GEVB
SOIC-8 Narrow Body CM1216
NCP1611