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

Features
  • 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

Applications
  • 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