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Manufacturer Part #


NCP Series 3.5 mA 65 kHz SMT Soft-Skip Mode Standby PWM Controller - SOIC-7

ECAD Model:
Mfr. Name: ON Semiconductor
Standard Pkg:
Product Variant Information section
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Product Specification Section
Technical Attributes
Attributes Table
Supply Current-Max: 3.5mA
Supply Voltage: 20V
Frequency-Max: 65kHz
Topology: Flyback
Duty Cycle-Min: 75%
Duty Cycle-Max: 85%
Operating Temp Range: -40°C to +150°C
Storage Temperature Range: -60°C to +150°C
Thermal Resistance: 177°C/W
Package Style:  SOIC-7
Mounting Method: Surface Mount
Features & Applications

The NCP1271 is a Soft-Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch.

The NCP1271 represents a new, pin to pin compatible, generation of the successful 7−pin current mode NCP12XX product series. The controller allows for excellent stand by power consumption by use of its adjustable Soft−Skip mode and integrated high voltage startup FET. This proprietary Soft−Skip also dramatically reduces the risk of acoustic noise. This allows the use of inexpensive transformers and capacitors in the clamping network. Internal frequency jittering, ramp compensation, timer−based fault detection and a latch input make this controller an excellent candidate for converters where ruggedness and component cost are the key constraints.

Key Features:

  • Fixed−Frequency Current−Mode Operation with Ramp Compensation and Skip Cycle in Standby Condition
  • Timer−Based Fault Protection for Improved Overload Detection
  • “Soft−Skip Mode” Technique for Optimal Noise Control in Standby
  • Internal High−Voltage Startup Current Source for Lossless Startup
  • ±5% Current Limit Accuracy over the Full Temperature Range
  • Adjustable Skip Level
  • Internal Latch for Easy Implementation of Overvoltage and Overtemperature Protection
  • Frequency Jittering for Softened EMI Signature
  • +500 mA/−800 mA Peak Current Drive Capability
  • Sub−100 mW Standby Power can be Achieved
  • Pin−to−Pin Compatible with the Existing NCP120X Series
  • This is a Pb−Free Device


  • Efficient protective circuitry
  • Provides improved efficiency at light loads and reduces the acoustic noise
  • Clean and loss less start-up sequence and reduces component count


  • AC−DC Adapters for Notebooks, LCD Monitors
  • Offline Battery Chargers
  • Consumer Electronic Appliances STB, DVD, DVDR
Pricing Section
Global Stock:
On Order:
Factory Stock:Factory Stock:
Factory Lead Time:
46 Weeks
Minimum Order:
Multiple Of:
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Web Price
Product Variant Information section