NCP1247: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design

Description: The NCP1247 is a new fixed-frequency current-mode ...
  • The NCP1247 is a new fixed-frequency current-mode PWM 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 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 NCP1247 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 combined with secondary side controller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side controller signals the NCP1247 to enter a sleep mode, minimizing the power consumption of the control circuitry. The NCP1247 is very similar in its functionality to the NCP1246. The NCP1247 is designed to get better performance out of systems with synchronous rectification.

    NCP1247
    - Adds C & D option for different Brown Out threshold
    - Enhanced operation with Sync Rec in light load
    - Increased HV timer
    - Revised X2 discharge sequence

    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
  • USB-Pd (USB Power Delivery)
  • Offline USB Pd
  • End Products
  • Notebook Computers
  • Offline USB Power Delivery SMPS
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Product Change Notification
    Availability and Samples
    NCP1247AD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Newark:>1K
  • ON Semiconductor:60,000
  • NCP1247AD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1247BD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):13 to 16
  • Arrow:0
  • ON Semiconductor:110,000
  • NCP1247BD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • 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
  • ON Semiconductor:2,500
  • NCP1247CD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1247CD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1247DD065R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1247DD100R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design
  • Package Type: SOIC-7
  • Package Case Outline: 751U
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • 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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