NCP1129: High Voltage Switching Regulator for Offline SMPS

Description: The NCP1129 switcher offers everything needed to b...
  • The NCP1129 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1129 can be safely designed for international conditions without jeopardizing the overall reliability.

    The NCP1129 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies.

    A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation.

    With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher 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.
  • Features
  • 650 V Avalanche Rated MOSFET - Rugged MOSFET for robust design
  • FixedFrequency 65 or 100 kHz CurrentMode Control Operation - Ability to scale for efficiency or size
  • Frequency Foldback Down to 26 kHz and SkipCycle in Light Load Conditions - Eliminate acoustic noise and improved efficiency at light loads
  • Adjustable Current Limit - Scale for various designs 5W~20W
  • 50 ms Timer-Based Auto-Recovery Short-Circuit Protection - Provides more robust protection without worrying about the coupling of the aux winding
  • Frequency Jittering in Normal and Frequency Foldback Modes - Improved efficiency at light load / Improved EMI over the entire load
  • Option for Auto-Recovery or Latched Short-Circuit Protection - Flexible protection options
  • Less than 100 mW Standby Power at High Line - EPS 2.0 Compliant
  • Applications
  • Power Supply
  • End Products
  • Power supply for DVD, STB, CD-Player
  • Aux supply for TV, USB, Appliance
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Availability and Samples
    NCP1129AP100G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Latch
  • Package Type: PDIP-8
  • Package Case Outline: 626B
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • NCP1129AP65G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Latch
  • Package Type: PDIP-8
  • Package Case Outline: 626B
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • ON Semiconductor:9,550
  • NCP1129BP100G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Auto-recovery
  • Package Type: PDIP-8
  • Package Case Outline: 626B
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • NCP1129BP65G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Auto-recovery
  • Package Type: PDIP-8
  • Package Case Outline: 626B
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • Digikey:<1K
  • ON Semiconductor:19,750
  • Applications
    Specifications
  • Control Mode: Current Mode 
  • fsw Typ (kHz): 100  65 
  • fJitter Typ (%): +/-5% of FSW 
  • Stand-by Mode: Yes 
  • RDS(ON) Typ (Ω):
  • V(BR)DSS Max (V): 650 
  • IPeak (mA):
  • HV Start-up Min (V): Yes 
  • DSS (mA):
  • UVLO: 8.8 
  • Short Circuit Protection: Yes 
  • Over Power Compensation: No 
  • Brown-out: No 
  • Latch: Yes  No 
  • Package Type: PDIP-8 
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