NCP1250: PWM Controller, Current Mode, for Offline Power Supplies

Description: The NCP1250 is a highly integrated PWM controller ...
  • The NCP1250 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 its 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. 40W Adapter
    Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. An Over Voltage Protection input is also combined on the same pin and protects the whole circuitry in case of optocoupler failure or adverse open loop operation.
    Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.
  • Features
  • Non-dissipative internal and adjustable Over Power Protection (OPP) circuits - Limits maximum delivered power without affecting standby performance
  • Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions - High efficiency in light load conditions
  • Internal Ramp Compensation - Reduces the number of external components
  • Frequency jittering from full load to skip-cycle - Improved EMI performance
  • Latch input for OVP and OTP implementations - Simple implementation of required protection functions
  • See NCP1251 for integrated Over Voltage Protection (OVP) monitoring on the Vcc pin
  • Applications
  • Offline Adapters
  • AC-DC converters
  • End Products
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Product Change Notification
    Availability and Samples
    NCP1250ASN100T1G
  • 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
  • NCP1250ASN65T1G
  • 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):Contact Factory
  • Arrow:0
  • Digikey:>1K
  • NCP1250BP65G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Current Mode, for Offline Power Supplies
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):4 to 8
  • Arrow:0
  • Digikey:>1K
  • ON Semiconductor:382,100
  • NCP1250BSN100T1G
  • Status: Lifetime
  • 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):Contact Factory
  • Arrow:0
  • ON Semiconductor:6,000
  • NCP1250BSN65T1G
  • 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):17 to 20
  • Arrow:0
  • Digikey:>1K
  • Newark:>1K
  • Packages
    Applications
    Specifications
  • Topology: Flyback 
  • Control Mode: Current Mode 
  • fsw Typ (kHz): 65 
  • Stand-by Mode: Yes 
  • UVLO (V): 8.8 
  • Short Circuit Protection: Yes 
  • Latch: Yes 
  • Soft Start: Yes 
  • VCC Max (V): 28 
  • Drive Cap. (mA): 300 / 500 
  • Package Type: TSOP-6  PDIP-8 
  • ON Semiconductor Full Web Site