NCP1351: Controller, Variable Off-Time Current Mode, with Short Circuit Protection

Description: The NCP1351 is a current mode controller targeting...
  • The NCP1351 is a current mode controller targeting low power off line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.
    An externally adjustable timer permanently monitors the feedback activity and protects the supply in presence of a short circuit or an overload. Once the timer elapses, NCP1351 stops switching and stays latched for version A, and tries to restart for Version B.
    The internal structure features an optimized arrangement which allows one of the lowest available startup current, a fundamental parameter when designing low standby power supplies. The negative current sensing technique minimizes the impact of the switching noise on the controller operation and offers the user to select the maximum peak voltage across his current sense resistor. Its power dissipation can thus be application optimized.
    Finally, the bulk input ripple ensures a natural frequency smearing which smooths the EMI signature.
  • Features
  • Quasi fixed TON, Variable TOFF Current Mode Control - Natural frequency foldback
  • Frequency foldback with Peak Current Compression - Noise free & improved efficiency in light load
  • Short circuit protection (latched A version or auto restart B version) - Independent of the auxiliary Winding
  • Primary or secondary side regulation
  • Dedicated Latch Input for OTP, OVP
  • Low start-up current
  • Natural frequency jittering
  • Negative current sensing with programmable current sense resistor
  • Applications
  • Auxiliary Power Supply
  • Off-line battery chargers
  • End Products
  • Printers
  • Adapters
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Product Change Notification
    Availability and Samples
    NCP1351ADR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1351APG
  • Status: Obsolete
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • NCP1351BDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

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  • NCP1351BPG
  • Status: Obsolete
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • NCP1351CDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1351CPG
  • Status: Obsolete
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • NCP1351DDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1351DPG
  • Status: Obsolete
  • Compliance: Pb-free Halide free 
  • Description: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Packages
    Specifications
  • Topology: Flyback 
  • Control Mode: Current Mode 
  • fsw Typ (kHz): Variable 
  • Stand-by Mode: No 
  • UVLO (V): Yes 
  • Short Circuit Protection: Yes 
  • Latch: Yes 
  • Soft Start: No 
  • VCC Max (V): 28 
  • Drive Cap. (mA): 400 / 400 
  • Package Type: SOIC-8 
  • ON Semiconductor Full Web Site