NCP1253: PWM Controller, Current Mode, for Offline Power Supplies

Description: The NCP1253 is a highly integrated PWM controller ...
  • The NCP1253 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back it's switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal. Besides the auto-recovery timer-based short-circuit protection, an Over Voltage Protection on the Vcc pin protects the whole circuitry in case of optocoupler destruction or adverse open loop operation.
  • Features
  • Frequency Foldback down to 26 kHz and Skip-Cycle in Light Load - Improved efficiency across the load range
  • Internal Ramp Compensation - Reduces the number of external components
  • Frequency Jittering in Normal and Frequency Foldback modes - Low EMI signature
  • Over Voltage Protection (OVP) monitoring on the Vcc pin - Protects against output over voltage conditions without any added components
  • Timer-based Auto-Recovery or Latched Short-Circuit Protection - Protection against fault conditions
  • Applications
  • Offline Adapters
  • AC-DC converters
  • End Products
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
  • Technical Documentation & Design Resources
    Availability and Samples
    NCP1253ASN100T1G
  • Status: Last Shipments
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Current Mode, for Offline Power Supplies
  • Package Type: TSOP-6
  • Package Case Outline: 318G-02
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • NCP1253ASN65T1G
  • Status: Last Shipments
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Current Mode, for Offline Power Supplies
  • Package Type: TSOP-6
  • Package Case Outline: 318G-02
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • NCP1253BSN100T1G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Current Mode, for Offline Power Supplies
  • Package Type: TSOP-6
  • Package Case Outline: 318G-02
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):8 to 12
  • Arrow:0
  • Digikey:>1K
  • ON Semiconductor:72,000
  • NCP1253BSN65T1G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Current Mode, for Offline Power Supplies
  • Package Type: TSOP-6
  • Package Case Outline: 318G-02
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):8 to 12
  • Arrow:0
  • Digikey:>1K
  • Newark:>1K
  • Wpi:>10K
  • Specifications
  • Topology: Flyback 
  • Control Mode: Current Mode 
  • fsw Typ (kHz): 100  65 
  • Stand-by Mode: Yes 
  • UVLO (V): 8.8 
  • Short Circuit Protection: Yes 
  • Latch: No 
  • Soft Start: Yes 
  • VCC Max (V): 28 
  • Drive Cap. (mA): 300 / 500 
  • Package Type: TSOP-6 
  • ON Semiconductor Full Web Site