NCP1623: Critical Conduction Mode (CrM) Power Factor Correction Controller, Follower Boost

Datasheet: Enhanced, High-Efficiency Power Factor Controller
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The NCP1623 is a controller designed to drive PFC boost stages. Based on an innovative Valley Synchronized Frequency Fold-back (VSFF) method, it operates in critical conduction mode (CrM) until the power drops below a threshold level. The PFC controller enters discontinuous conduction mode (DCM) with increased dead-time as the load further decays (frequency foldback). VSFF maximizes the efficiency at both nominal and light loads. In addition, an internal circuitry ensures a near-unity power factor even when the switching frequency is reduced.

Housed in a TSOP-6 package, the circuit also incorporates the features necessary for robust and compact PFC stages, with few external components. The A version provides the follower boost capability for drastic low-line efficiency improvement. This controller is also available in the SOIC-8 package, which features an ultra-low-consumption mode externally controlled by the disable pin.

Features   Benefits
     
  • Critical Conduction Mode (CrM) in heavy load conditions
 
  • Maximizes the efficiency at both nominal and light loads
  • Discontinuous Conduction Mode (DCM) with Frequency Foldback in light load
 
  • Maximizes the efficiency at both nominal and light loads
  • Follower Boost capability (NCP1623A only)
 
  • Improves low line and full load efficiency
  • Sleep Mode with circuit consumption below 100 µA (SOIC-8 version only)
 
  • Improves no load and ultra light load efficiency
  • Zero Current Detection via Drain sensing
 
  • Simplifies PFC inductor design, eliminates auxiliary winding
  • Dynamic Response Enhancer
 
  • Fast line & load transient response
  • Near unity power factor over the load range
 
  • Meets typical power supply spec
Applications   End Products
  • Power Factor Correction
  • Offline Power Supply
 
  • USB PD Mobile & Laptop Charging
  • Industrial Power Supplies
  • Computing Power Supplies
  • Gaming Power Supplies
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1623ADR2G Active 
Pb-free
Halide free
NCP1623, Critical Conduction Mode (CrM) PFC Controller SOIC-8 751-07 1 260 Tape and Reel 2500 $0.3467
NCP1623ASNT1G Active 
Pb-free
Halide free
NCP1623, Critical Conduction Mode (CrM) PFC Controller TSOP-6 318G-02 1 260 Tape and Reel 3000 $0.3267
NCP1623CDR2G Active 
Pb-free
Halide free
NCP1623, Critical Conduction Mode (CrM) PFC Controller SOIC-8 751-07 1 260 Tape and Reel 2500 $0.3467
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
NCP1623ADR2G  
 $0.3467 
Pb
H
 Active   
CRM
Variable
Current Mode
Step-Up
Variable
30
500 / 800
10.5
Yes
Yes
No
SOIC-8
NCP1623ASNT1G  
 $0.3267 
Pb
H
 Active   
CRM
Variable
Current Mode
Step-Up
Variable
30
500 / 800
10.5
Yes
Yes
No
TSOP-6
NCP1623CDR2G  
 $0.3467 
Pb
H
 Active   
CRM
Variable
Current Mode
Step-Up
Variable
30
500 / 800
10.5
Yes
Yes
No
SOIC-8
Case Outlines
751-07    318G-02   
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Power Factor Improvement Methods with Their Advantages & Disadvantages
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