NCP1681: Totem Pole Continuous Conduction Mode (CCM) / Multi-mode (CrM-CCM) Power Factor Correction Controller

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The NCP1681 is a PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. The controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.
Features   Benefits
     
  • Totem Pole PFC Topology Eliminates Input Diode Bridge
 
  • Enables High Efficiency & Compact Design
  • Continuous Conduction Mode (CCM) Operation At High Power Level
 
  • Optimized Efficiency For High Power Design
  • Optional Multi-mode Operation With CCM at High Power & CrM at Medium Power Level
 
  • Optimized Performance Across Power Levels
  • Frequency Foldback in DCM With 25 kHz Minimum Frequency
 
  • Prevents Operation in Audible Range
  • Skip Mode in Very Light Load Condition
 
  • Complies with Energy Efficiency Regulatory Standards
  • Novel Current Sense Scheme
 
  • Cycle-by-Cycle Current Limit Without Hall Effect Sensor
  • Digital Voltage Loop Compensation
 
  • Simplifies Design & Reduces External Components
  • AC Line Monitoring Circuit & AC Phase Detection
 
  • Simplifies Design & Reduces External Components
  • Near Unity Power Factor in All Operating Modes
 
  • Complies with Energy Efficiency Regulatory Standards
  • PFC OK Indicator
 
  • Allows Communication with Downstream Converter to Optimize System Performance
Applications   End Products
  • Power Factor Correction
  • Offline Power Supply
 
  • Server Power
  • Telecom 5G Power
  • Networking Power
  • Gaming Console Power Supplies
  • UHD TV Power Supplies
  • Industrial Power Supplies
Technical Documentation & Design Resources
White Papers (1) Videos (1)
Package Drawings (1)  
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1681AAD2R2G Active 
Pb-free
Halide free
NCP1681, Totem Pole Continuous Conduction Mode (CCM) Power Factor Correction Controller SOIC20 NB LESS PIN 17 & 19 751EZ 1 260 Tape and Reel 2500 $2.6399
NCP1681ABD2R2G Active 
Pb-free
Halide free
NCP1681, Totem Pole Continuous Conduction Mode (CCM) Power Factor Correction Controller SOIC20 NB LESS PIN 17 & 19 751EZ 1 260 Tape and Reel 2500 $2.6399
NCP1681BAD2R2G Active 
Pb-free
Halide free
NCP1681, Totem Pole Multi-mode (CrM-CCM) Power Factor Correction Controller SOIC20 NB LESS PIN 17 & 19 751EZ 1 260 Tape and Reel 2500 $2.6399
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory

Product
Description
Pricing ($/Unit)
Compliance
Status
PFC Mode
Frequency Operation
Control Mode
Topology
fSW Typ (kHz)
VCC Max (V)
Drive Cap. (mA)
UVLO (V)
Latch
UVP
Inhibition
Package Type
NCP1681AAD2R2G  
 $2.6399 
Pb
H
 Active   
CCM
Fixed
Current/Voltage Mode
Step-Up
65
30
100 / 100
10.5
Yes
Yes
No
SOIC20 NB LESS PIN 17 & 19
NCP1681ABD2R2G  
 $2.6399 
Pb
H
 Active   
CCM
Fixed
Current/Voltage Mode
Step-Up
95
30
100 / 100
10.5
Yes
Yes
No
SOIC20 NB LESS PIN 17 & 19
NCP1681BAD2R2G  
 $2.6399 
Pb
H
 Active   
MM
Variable
Current/Voltage Mode
Step-Up
65 / Variable
30
100 / 100
10.5
Yes
Yes
No
SOIC20 NB LESS PIN 17 & 19
Case Outlines
751EZ   
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