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NCP1341: Quasi-Resonant Controller, High-Voltage, Featuring Valley Lock-Out Switching with Power Excursion Mode (PEM)

Datasheet: High-Voltage, Quasi-Resonant Controller featuring Valley Lock-Out Switching
Rev. 6 (1192kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1341 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 NCP1341 can enable no−load power consumption below 30 mW. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1341 enters quiet−skip mode to manage the power delivery. The NCP1341 integrates power excursion mode (PEM) to minimize transformer size in designs requiring high transient load capability. If transient load capability is not desired, the NCP1340 offers the same performance and features without PEM. To help ensure converter ruggedness, the NCP1341 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 over voltage and NTC−ready over-temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.
Features   Benefits
     
  • QR Frequency Jittering
 
  • Reduces EMI Signature
  • New Quiet-Skip Technology
 
  • Ensures Operation Outside Audible Range
  • Integrated HV Startup with Brownout Protection
 
  • Provides an efficient power-on source and protects agaisnts drops in input mains voltage
  • Valley Switching Operation with Valley Lockout
 
  • Maximizing the efficiency over the entire power range
  • Integrated X2 Capacitor Discharge Capability
 
  • Eliminates the need for a X2 resistors
  • 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 implementations
 
  • Simple implementation of required protection functions
  • Power Excursion Mode (PEM)
 
  • Minimize transformer size in designs requiring high transient load capability
Applications   End Products
  • Medium or High Power AC-DC Adapters
  • Ultra High Density AC-DC Adapters
  • Computer Power Supplies
  • Phone and Tablet Adapters
 
  • Notebook Adpaters
  • Flat TV SMPS
  • Computer Power Supplies
  • Phone and Tablet Adapters
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1341GEVB Active
Pb-free
High-Voltage, Quasi-Resonant Controller Featuring Valley Lock-Out Switching Evaluation Board.
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1341A1D1R2G Active
Pb-free
Halide free
NCP1341 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.4133
NCP1341B1D1R2G Active
Pb-free
Halide free
NCP1341 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.4133
NCP1341B1DR2G Active
Pb-free
Halide free
NCP1341 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.4
NCP1341B4D1R2G Active
Pb-free
Halide free
NCP1341 SOIC-9 NB 751BP 1 260 Tape and Reel 2500 $0.4133
Market Leadtime (weeks) : 13 to 16
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 47,500
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 37,500
Market Leadtime (weeks) : 13 to 16

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
NCP1341A1D1R2G  
 $0.4133 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 / 800
SOIC-9 NB
NCP1341B1D1R2G  
 $0.4133 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
NCP1341B1DR2G  
 $0.4 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-8
NCP1341B4D1R2G  
 $0.4133 
Pb
H
 Active   
Flyback
Current Mode
Variable
Yes
9
Yes
No
Yes
30
500 / 800
SOIC-9 NB
Case Outlines
751BP    751-07   
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High-Voltage, Quasi-Resonant Controller Featuring Valley Lock-Out Switching Evaluation Board - NCP1341GEVB

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