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NCP1246: Controller, Fixed Frequency, Current Mode, for Flyback Converters

Datasheet: Fixed Frequency Current Mode Controller for Flyback Converters
Rev. 7 (1259kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1246 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply. This function greatly simplifies the design of the auxiiary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stnad-by etc. This device contains a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry.
The NCP1246 features a timer-based fault detection that ensures the detection of overload and an adjustable power 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 achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for robust power supply designs.
A dedicated off mode allows the SMPS to reach extremely low no load input power consumption when combinded with secondary side contoller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side contoller signals the NCP1246 to enter a sleep mode, minimizing 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
 
  • Optimized efficiency across the entire load range
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
 
  • Protection against overcurrent and short circuit
  • High-voltage startup with dynamic self supply
 
  • Simplifies the design of the auxiliary supply
  • Integrated brown-out detection
 
  • Protects against any drops in line voltage
  • Frequency Modulation
 
  • Softened EMI signature
  • Adjustable overpower protection
 
  • Automatically adjusts the current limit depending on the line input voltage (high line or low line)
  • Latch off input
 
  • Protection against faults
Applications   End Products
  • AC-DC Adapters
  • LCD TV power supplies
 
  • Notebook Computers
Availability & Samples
Specifications
Case Outlines
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1246AD065R2G Active
Pb-free
Halide free
NCP1246 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246AD100R2G Lifetime
Pb-free
Halide free
NCP1246 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246ALD065R2G Active
Pb-free
Halide free
NCP1246, , OVL Latch, Lower Limits SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246ALD100R2G Active
Pb-free
Halide free
NCP1246, , OVL Latch, Lower Limits SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246BD065R2G Active
Pb-free
Halide free
NCP1246 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246BD100R2G Active
Pb-free
Halide free
NCP1246 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246BLD065R2G Active
Pb-free
Halide free
NCP1246, , OVL Autorecovery, Lower Limits SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1246BLD100R2G Active
Pb-free
Halide free
NCP1246, , OVL Autorecovery, Lower Limits SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
Market Leadtime (weeks) : 13 to 16
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 75,000
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 13 to 16
Market Leadtime (weeks) : 13 to 16
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 2,500

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
NCP1246AD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246ALD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246ALD100R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246BD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246BD100R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246BLD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1246BLD100R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
Case Outlines
751U   
Packages
NCP1246: Controller, Fixed Frequency, Current Mode, for Flyback Converters
NCP1246: Controller, Fixed Frequency, Current Mode, for Flyback Converters
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