NCP1612: Power Factor Controller, Enhanced, High Efficiency

The NCP1612 is active power factor corrected (PFC) controller specifically designed for use as a boost pre-converter 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 NCP1612 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. This device is particularly suited a PFC stage for LLC controllers due to its dedicated PFC_Okay Output.

Features
  • Critical conduction mode with current controlled frequency foldback
  • Dynamic Response Enhancer
  • Soft Overvoltage Protection
  • -500 mA/+800 mA Drive Capability
  • Valley turn on
  • Wide Vcc Range of 9.5-35 Vdc
  • Two Vcc startup versions: 10.5 V (A) and 17 V (B)
  • AC Line Brownout Detection
  • Cycle-by-cycle switch current monitoring
  • Saturated inductor and shorted boost or bypass diode detection
  • PFC Okay Output
  • Latch Off Input
  • Independent bulk overvoltage and undervoltage monitoring
  • Open Ground Pin Fault Monitoring
  • Near Unity Power Factor
  • Thermal Shutdown
Benefits
  • Optimizes conversion efficiency across load range
  • Improved transient response for line and load steps
  • Reduces accoustic noise and stress in the event of an overvoltage fault
  • Supports wide range of MOSFETs and power levels
  • Improved efficiency amd reduced EMI generation
  • Easy to bias even under light load or high line conditions
  • B version allows smaller Vcc capacitor and faster startup in self biased applications
  • Protects boost stage power components during line fault conditions
  • Enhances system robustness
  • Enhanced safety monitoring without extra components
  • Can enable downstream controller of stable PFC rail
  • Simplifies implemented latch protection for power supply
  • Increased system reliablity
  • Simplifies safety testing
Applications
  • Offline Power Supplies
  • Lighting Ballasts
  • LED Lighting Drivers and Power Supplies
End Products
  • Flat TV
  • All-In-One Computers
  • High Powered Adapters
  • LED Lighting
Design & Development Tools (1)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1612 Design WorksheetNCP1612 DWS.XLS (2523.0kB)0
Package Drawings (1)
Document TitleDocument ID/SizeRevision
SOIC-10 NB751BQ (56.7kB)B
Application Notes (4)
Document TitleDocument ID/SizeRevisionRevision Date
5 Key Steps to Design a Compact, High-Efficiency PFC State Using the NCP1612AND9065/D (250kB)1Mar, 2015
Good Practice for the NCP1602 CSZCD Pin Design and PCB LayoutAND9454/D (200kB)0Jun, 2016
NCP1611/NCP1612 Tips and TricksAND9077/D (557.0kB)2
Safety Tests on a NCP1612-Based PFC StageAND9079/D (709kB)2Mar, 2015
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Enhanced, High-Efficiency Power Factor ControllerNCP1612/D (651kB)10Nov, 2016
Evaluation Board Documents (5)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1612GEVB Bill of Materials ROHS CompliantNCP1612GEVB_BOM_ROHS.PDF (75.0kB)0
NCP1612GEVB Evaluation Board User's ManualEVBUM2051/D (1737.0kB)1
NCP1612GEVB Gerber Layout Files (Zip Format)NCP1612GEVB_GERBER.ZIP (35.0kB)0
NCP1612GEVB SchematicNCP1612GEVB_SCHEMATIC.PDF (79.0kB)0
NCP1612GEVB Test ProcedureNCP1612GEVB_TEST_PROCEDURE.PDF (157.0kB)0
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1612GEVBActivePb-free160 W Low Profile PFC Evaluation Board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1612A1DR2GActivePb-free Halide freeSOIC-10 NB751BQ1Tape and Reel2500$0.3
NCP1612A2DR2GActivePb-free Halide freeSOIC-10 NB751BQ1Tape and Reel2500$0.3
NCP1612A3DR2GActivePb-free Halide freeSOIC-10 NB751BQ1Tape and Reel2500$0.4
NCP1612ADR2GActivePb-free Halide freeSOIC-10 NB751BQ1Tape and Reel2500$0.3
NCP1612BDR2GActivePb-free Halide freeSOIC-10 NB751BQ1Tape and Reel2500$0.3
Specifications
ProductPFC ModeFrequency OperationControl ModeTopologyfSW Typ (kHz)VCC Max (V)Drive Cap. (mA)UVLO (V)LatchUVPInhibition
NCP1612A1DR2GDCM CRMVariableCurrent ModeStep-UpVariable35500 / 8009YesYesYes
NCP1612A2DR2GDCMVariableCurrent ModeStep-UpVariable35500 / 8009YesYesYes
NCP1612A3DR2GCRM DCMFixedCurrent ModeStep-UpVariable35500 / 8009YesYesYes
NCP1612ADR2GDCM CRMVariableCurrent ModeStep-UpVariable35500 / 8009YesYesYes
NCP1612BDR2GCRM DCMVariableCurrent ModeStep-UpVariable35500 / 8009YesYesYes
Enhanced, High-Efficiency Power Factor Controller (651kB) NCP1612
NCP1612 Design Worksheet NCP1612
5 Key Steps to Design a Compact, High-Efficiency PFC State Using the NCP1612 NCP1612
Good Practice for the NCP1602 CSZCD Pin Design and PCB Layout NCP1612
NCP1611/NCP1612 Tips and Tricks NCP1612
Safety Tests on a NCP1612-Based PFC Stage NCP1612
NCP1612GEVB BOM ROHS NCP1612GEVB
EVBUM2051/D - 1737 NCP1612GEVB
NCP1612GEVB GERBER NCP1612GEVB
NCP1612GEVB SCHEMATIC NCP1612GEVB
NCP1612GEVB TEST PROCEDURE NCP1612GEVB
SOIC-10 NB LA4537MC
NCP1612
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