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NCP1937: Combination Power Factor Correction & Quasi-Resonant Flyback Controller

Datasheet: Combination Power Factor Controller & Quasi-Resonant Flyback Controller
Rev. 6 (1065kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
This combination IC integrates power factor correction (PFC) and quasi-resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application.

The PFC stage exhibits near-unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp. The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components.

The quasi-resonant current-mode flyback stage features a proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption.

Features   Benefits
     
  • <10mW No Load Standby Performance
 
  • Lowest no load performance
  • High Voltage Startup Circuit and Active Input Filter Capacitor Discharge Circuitry
 
  • Eliminates the need for an external HV startup circuit and X2 resistors.
  • High Voltage Line Voltage Detector
 
  • Optimize performance based on 110 v or 220 V ac mains
  • Integrated High Voltage Switch Disconnects PFC Feedback Resistor Divider
 
  • Reduces no load standby power
  • Fault Input for Severe Fault Conditions
 
  • Enhanced protection capability
  • Bi-Level Line-Dependent Output Voltage
 
  • Optimized system with different input voltages
  • Boost Diode Short-Circuit Protection
 
  • Enhanced protection features
  • Adjustable PFC Disable Threshold Based on Output Power
 
  • Optimized system to improve efficiency
  • Frequency Foldback with Minimum Frequency Clamp
 
  • Enhanced efficiency at light and no load
  • Minimum Frequency Clamp
 
  • Eliminates audible noise
  • Valley Switching Operation with Valley-Lockout
 
  • Noise free operation
  • PFC
   
  • QR Flyback Controller
   
Applications   End Products
  • Adapters
  • Combo PFC+QR
 
  • All-In-One (AIO) Computers
  • High Power Notebook Adapters
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1937BADAPGEVB Active
Pb-free
90 W Adapter PFC+QR 10 MW Evaluation Board
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1937A1DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937A2DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937A3DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937B1DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937B2DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937B3DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937B51DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937C1DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937C4DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
NCP1937C61DR2G Active
Pb-free
Halide free
NCP1937 SOIC-20 NB 751BS 1 260 Tape and Reel 2500 $0.7466
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 8 to 12
ON Semiconductor   (2020-09-02 00:00) : 2,500
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12

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
NCP1937A1DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
NCP1937A2DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
NCP1937A3DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
NCP1937B1DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
No
Yes
Yes
SOIC-20 NB
NCP1937B2DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
No
Yes
Yes
SOIC-20 NB
NCP1937B3DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
No
Yes
Yes
SOIC-20 NB
NCP1937B51DR2G  
 $0.7466 
Pb
H
 Active   
SOIC-20 NB
NCP1937C1DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
NCP1937C4DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
NCP1937C61DR2G  
 $0.7466 
Pb
H
 Active   
CRM
Variable
Current Mode
Flyback
Variable
30
0.5
Yes
Yes
Yes
Yes
SOIC-20 NB
Case Outlines
751BS   
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