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NCP1631: Power Factor Controller, 2-Phase, Interleaved

Datasheet: Interleaved, 2-Phase Power Factor Controller
Rev. 8 (529kB)
Product Overview
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The NCP1631 is a controller for use in 2-phase interleaved power factor correction pre-converters. Interleaving consists of paralleling two small stages in lieu of a single big stage. This approach has several merits like ease of implementation, ability to use smaller components, and better distribution of heating. These attributes make the interleaved PFC topology attractive to slim form factor applications such as flat panel TVs and ultra-slim notebook adapters. Interleaving can also extend the power range of Critical Conduction Mode, which is an efficient and cost-effective (no need for low trr diodes) operating mode. The NCP1631 operates in Frequency Clamped Critical Conduction mode (FcCrM). The circuit utilizes frequency foldback to linearly decay the clamping frequency as a function of power. As a result, the NCP1631 provides optimized efficiency across the load range. In addition, the NCP1631 drivers exhibit a 180 phase shift for a significantly reduced current ripple, which lowers EMI and reduces the rms current in the bulk capacitor. The NCP1631 incorporates all the features necessary for building robust and compact interleaved PFC stages, with a minimum of external components. Available in SOIC-16 package.
Features   Benefits
     
  • 180° out of phase operation
 
  • Low EMI and reduces RMS current in the bulk capacitor
  • Frequency foldback at low power
 
  • Improved light load efficiency
  • Integrated overcurrent protection, overvoltage protection, UVLO, and brown-out protection
 
  • Increased robustness with few external components
  • Frequency clamped critical conduction mode (FcCrM) operation
 
  • Optimized efficiency over the load range
Applications   End Products
  • Flat panel TVs
  • SMPS
  • Offline appliances requiring power factor correction
 
  • LCD TV
  • Computer power supplies
  • Servers
Availability & Samples
Specifications
Case Outlines
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1631DR2G Active
Pb-free
Halide free
NCP1631 SOIC-16 751B-05 1 260 Tape and Reel 2500 $0.7333
Market Leadtime (weeks) : 8 to 12
PandS   (2020-09-14 00:00) : <1K
FutureElectronics   (2020-08-19 00:00) : >1K

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
NCP1631DR2G  
 $0.7333 
Pb
H
 Active   
CRM
Variable
Voltage Mode
Step-Up
Up to 500
20
500 / 500
9.5 - 12
Yes
Yes
YES
SOIC-16
Case Outlines
751B-05   
Packages
NCP1631: Power Factor Controller, 2-Phase, Interleaved
NCP1631: Power Factor Controller, 2-Phase, Interleaved
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