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NCP1244: Controller, Fixed Frequency, Current Mode, for Flyback Converters

Datasheet: Fixed Frequency Current Mode Controller for Flyback Converters
Rev. 2 (1443kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1244 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply. This 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 start-up, transients, latch, stand-by etc. This device contains a special HV dtector which detects the application unplug from the AC input line and triggers the X2 discharge current.
It features a timer-based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieveing very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for the robust power supply designs.
A dedicated OFF mode allows to reach the extremely low no load input power consumption via sleeping whole device and thus minimze the power consumption of the control circuitry.
This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.
Features   Benefits
     
  • Frequency Foldback and Skip Mode
 
  • Maximizes efficiency in light load and standby conditions
  • Timer-Based Overload Protection with Latched (Option A) or Auto-Recovery (Option B) operation
 
  • Protection against overcurrent or short circuit conditions
  • High voltage current source with Dynamic Self Supply (DSS)
 
  • Provides fast, loss-less startup
  • Internal Frequency Jittering
 
  • Softer EMI signature
  • Adjustable overpower protection
 
  • Compensates peak current for changing line input voltage
  • Dedicated latch off input
 
  • Simplifies protection for fault conditions like overtemperature or overvoltage
  • Integrated X2 capacitor discharge
 
  • Eliminates the X2 capacitor discharge resistors and their associated parasitic consumption
  • Power saving off mode when used with NCP4353 or NCP4354
 
  • Allows the power supply to achieve extremely low no load power consumption
Availability & Samples
Specifications
Case Outlines
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1244AD065R2G Active
Pb-free
Halide free
NCP1244, 65 kHz SOIC-7 751U 1 260 Tape and Reel 2500 $0.4667
NCP1244AD100R2G Active
Pb-free
Halide free
NCP1244, 100 kHz SOIC-7 751U 1 260 Tape and Reel 2500 $0.4667
NCP1244BD065R2G Obsolete
Pb-free
Halide free
NCP1244, 65 kHz SOIC-7 751U 1 260 Tape and Reel 2500  
NCP1244BD100R2G Obsolete
Pb-free
Halide free
NCP1244, 100 kHz SOIC-7 751U 1 260 Tape and Reel 2500  
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02) : 32,500
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory

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
NCP1244AD065R2G  
 $0.4667 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1244AD100R2G  
 $0.4667 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
Case Outlines
751U   
Packages
NCP1244: Controller, Fixed Frequency, Current Mode, for Flyback Converters
NCP1244: Controller, Fixed Frequency, Current Mode, for Flyback Converters
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