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ON Semiconductor

ON Semiconductor
5005 East McDowell Road ,
Phoenix ,
AZ 85008
USA
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Model NCP12400 - Fixed Frequency Current Mode Controller

Model NCP12400 - Fixed Frequency Current Mode Controller

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The NCP12400 is a new fixed−frequency current−mode controller featuring the Dynamic Self−Supply. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during start−up, transients, latch, stand−by etc. This device contains a special HV detector which detects the application unplug from the ac input line and triggers the X2 discharge current.

Products Details

This HV structure allows the brown−out detection as well. It features a timer−based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for the robust power supply designs. A dedicated Off Mode allows to reach the extremely low no load input power consumption via “sleeping” whole device and thus minimize the power consumption of the control circuitry. In addition, the NCP12400 features a quiet skip mode which lockes the skip frequency below audiable range. This feature greatly reduces audiable noise caused by the switching pulses during skip mode.

Features

  • Integrated HV Start-up and X2 Discharge
  • Quiet Skip Feature
  • Frequency Foldback and Skip Mode
  • Timer-Based Overload Protection with Latched Or Auto-recovery
  • Fault Input for Overvoltage and Over Temperature Protection
  • Adjustable Overpower Protection Dependant on the Mains Voltage
  • No Load Standby Power < 30 mW
  • Frequency Modulation for Softened EMI Signature

Application

  • Auxiliary Power Supply for Computing Device
  • General 20 W to 65 W AC-DC Adapte

Benefits

  • Reduces Overall System Cost and Complexity
  • Ensures Skip Mode Operation Outside Audible Range
  • Average Efficiency Meets CoC Tier 2 Compliance
  • Configurable Protection Tailored for Application Needs.
  • Meets Safety Requirements
  • Meets Safety Requirements
  • Meets CoC Tier 2 Compliance
  • Meets EMI Compliance

End Products

  • Offline Adapters for Notebooks, LCD, and Printers
  • Offline Battery Chargers
  • Consumer Electronic Power Supplies

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