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

Description: The NCP1246 is a new fixed-frequency current-mode ...
  • 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
  • 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
  • AC-DC Adapters
  • LCD TV power supplies
  • End Products
  • Notebook Computers
  • Technical Documentation & Design Resources
    Product Change Notification
    Availability and Samples
    NCP1246AD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Digikey:>1K
  • Newark:>1K
  • NCP1246AD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • ON Semiconductor:60,000
  • NCP1246ALD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters, , OVL Latch, Lower Limits
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1246ALD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters, , OVL Latch, Lower Limits
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1246BD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Digikey:>1K
  • Newark:>1K
  • NCP1246BD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1246BLD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters, , OVL Autorecovery, Lower Limits
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • Newark:>1K
  • ON Semiconductor:20,000
  • NCP1246BLD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Fixed Frequency, Current Mode, for Flyback Converters, , OVL Autorecovery, Lower Limits
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • ON Semiconductor:5,000
  • Packages
    Applications
    Specifications
  • Topology: Flyback 
  • Control Mode: Current Mode 
  • fsw Typ (kHz): 65  100 
  • Stand-by Mode: Yes 
  • UVLO (V): 8.9 
  • Short Circuit Protection: Yes 
  • Latch: Yes 
  • Soft Start: Yes 
  • VCC Max (V): 28 
  • Drive Cap. (mA): 500 / 800 
  • Package Type: SOIC-7 
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