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NCP1342: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching

Datasheet: Quasi-Resonant Flyback Controller, High Frequency
Rev. 14 (951kB)
Product Overview
»View Material Composition
» Product Change Notification

The NCP1342 is a highly integrated quasi-resonant flyback controller suitable for designing high-performance off-line power converters. With an integrated active X2 capacitor discharge feature, the NCP1342 can enable no-load power consumption below 30 mW.

The NCP1342 features proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1342 enters quiet-skip mode to manage the power delivery while minimizing acoustic noise.

To ensure light load performance with high frequency designs, the NCP1342 incorporates Minimum Peak Current Modulation (MPCM) to reduce the switching frequency quickly. To help ensure converter ruggedness, the NCP1342 implements several key protective features such as internal brownout detection, a non-dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and NTC-ready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the ac line is removed.

Features   Benefits
     
  • Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF)
 
  • Fast reduction of switching frequency for improved light load efficiency
  • QR Frequency Jittering
 
  • Reduces EMI Signature
  • Quiet-Skip Technology
 
  • Ensures Operation Outside Audible Range
  • Integrated HV Startup with Brownout Protection
 
  • Provides an efficient power-on source and protects against drops in input mains voltage
  • Valley Switching Operaton with Valley Lockout
 
  • Maximizes the efficiency over the entire power range
  • Integrated X2 Capacitor Discharge Capability
 
  • Eliminates the need for a X2 resistor
  • NTC Compatible Fault Pin
 
  • Extra protection against high temperature or other fault conditions
  • High Drive Capability: -500 mA / +800 mA
 
  • Enables faster switching of primary-side MOSFET
  • Latch input for OVP and OTP implementation
 
  • Simple implementation of required protection functions
Applications   End Products
  • Medium or High Power AC-DC Adapters
  • Ultra High Density AC-DC Adapters
  • USB PD Compliant
 
  • Notebook Adapters
  • Flat TV SMPS
  • Computer Power Supplies
  • Phone and Tablet Adapters
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1342PD45WGEVB Active
NCP1342 45 W USB PD Evaluation Board
NCP1342PD65WGEVB Active
NCP1342 60 W USB PD Evaluation Board
NCP1342PD90WGEVB Active
NCP1342 90 W USB PD Evaluation Board
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1342AMAACD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342AMDADGD1R2G Active 
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342AMDCCDR2G Active
Pb-free
Halide free
NCP1342 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.4267
NCP1342AMDCDAD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342AMDCDD1R2G Active 
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342AMDCDHD1R2G Active 
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342ANACCED1R2G Active 
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342ANACECD1R2G Lifetime
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342ANACED1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342ANDAAD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342ANDBDD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342BMDCDAD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342BMDCDDD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
NCP1342DADBDD1R2G Active
Pb-free
Halide free
NCP1342 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.44
Market Leadtime (weeks) : 17 to 20
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 2 to 4
Market Leadtime (weeks) : 17 to 20
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 53,057
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 55,000
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 17,500
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 2,500
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 8 to 12

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Package Type
NCP1342AMAACD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342AMDADGD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342AMDCCDR2G  
 $0.4267 
Pb
H
 Active   
Flyback
Current Mode
variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-8
NCP1342AMDCDAD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342AMDCDD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342AMDCDHD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342ANACCED1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342ANACED1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342ANDAAD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342ANDBDD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1342BMDCDAD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 / 800
SOIC-9 NB
NCP1342BMDCDDD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 / 800
SOIC-9 NB
NCP1342DADBDD1R2G  
 $0.44 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 / 800
SOIC-9 NB
Case Outlines
751BP    751-07   
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