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Home » NEWEST Products » New by Manufacturer » ON Semiconductor » ON Semi NCP124x Fixed Frequency Current Mode Controllers
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ON Semiconductor NCP124x Fixed Frequency Current Mode Controllers

ON Semiconductor NCP124x Fixed
Frequency Current Mode Controllers

ON Semiconductor's NCP124x Fixed Frequency Current Mode Controllers are new fixed-frequency current-mode controllers featuring Dynamic Self-Supply. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal start-up current source to supply the controller during start-up, transients, latch, stand-by etc. These devices contain a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry (in NCP1246). 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.

  • Frequency foldback and skip mode
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
  • High-voltage startup with Dynamic Self Supply (DSS)
  • Integrated brown-out detection (in NCP1246)
  • Internal Frequency Jittering
  • Frequency Modulation
  • Adjustable overpower protection
  • Latch off input
  • Integrated X2 capacitor discharge
  • Power saving off mode when used with NCP4353 or NCP4354

  • AC-DC Adapters
  • LCD TV Power Supplies
  • Notebook Computers

Additional Resources

NCP1244 Datasheet
NCP1246 Datasheet
Application Circuit
Application Circuit
  • ON Semiconductor
  • Semiconductors|Integrated Circuits|IC-Power Management