NCP1234: Controller, Fixed Frequency, Current Mode, for Flyback Converters

Datasheet: Fixed Frequency Current Mode Controller for Flyback Converters
Rev. 2 (225kB)
Product Overview
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Product Change Notification
NCP1234 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply (DSS). This device is pin-to-pin compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.
It features a timer-based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage.
Features   Benefits
     
  • Frequency Foldback then Skip Mode in light load and standby conditions
 
  • High efficiency in light and no load conditions
  • High voltage current source with brown-out detection and dynamic self-supply
 
  • Directly powered from the high voltage rail with integrated brown-out sensing to detect low input voltage
  • Frequency Jittering
 
  • Helps pass EMI requirements by spreading out the energy content of frequency peaks
  • 4.0 ms Soft-Start
 
  • Minimizes the stress on power components
  • Adjustable Overpower Compensation
 
  • Monitors the input voltage to limit the amount of power being delivered by the converter
  • Latched / Autorecovery Timer-Based Overload Protection
 
  • Protects against overcurrent
Applications   End Products
  • Consumer Electronics Power Supplies
  • Auxiliary/Housekeeping power supplies
 
  • Notebooks
Technical Documentation & Design Resources
Design Notes (1) Package Drawings (1)
Data Sheets (1)  
Availability & Samples
Specifications
Case Outlines
Application Diagram
Interactive Block Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1234AD100R2G Active
Pb-free
Halide free
NCP1234 SOIC-7 751U 1 260 Tape and Reel 2500 $0.318
NCP1234AD65R2G Active
Pb-free
Halide free
NCP1234 SOIC-7 751U 1 260 Tape and Reel 2500 $0.318
NCP1234BD100R2G Active
Pb-free
Halide free
NCP1234 SOIC-7 751U 1 260 Tape and Reel 2500 $0.318
NCP1234BD65R2G Active
Pb-free
Halide free
NCP1234 SOIC-7 751U 1 260 Tape and Reel 2500 $0.318
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K

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
NCP1234AD100R2G  
 $0.318 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234AD65R2G  
 $0.318 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234BD100R2G  
 $0.318 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234BD65R2G  
 $0.318 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
Case Outlines
751U   
Packages
NCP1234: Controller, Fixed Frequency, Current Mode, for Flyback Converters
NCP1234: Controller, Fixed Frequency, Current Mode, for Flyback Converters
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