Power controller simplifies the circuit in half-bridge resonant converter designs


The NCP13994 from onsemi is a high-performance current-mode controller which integrates X2 capacitor discharge, start-up current source and gate drivers to reduce external component count in power supplies.

The NCP13994 is a high-performance current-mode controller for half-bridge resonant converters in offline power supplies.


The controller incorporates a 700 V-rated start-up current source and X2 capacitor discharge function as well as gate drivers for external MOSFETs. This simplifies the layout of power-supply circuits, and reduces the application component count.


The NCP13994 provides a dedicated output to interface with an external power factor correction (PFC) controller, a convenient feature for applications in which a PFC front end is needed. A quiet skip-mode technique also ensures excellent no-load and light-load efficiency.


The NCP13994 provides a suite of protection features that enable safe operation. These include:

  • Overload protection
  • Over-current protection
  • Brown-out detection
  • Open optocoupler detection
  • Over-voltage protection
  • Over-temperature protection


  • Switching frequency at full load up to 750 kHz
  • Automatic dead time with maximum dead time clamp


  • Servers
  • Telecoms equipment
  • Industrial power supplies
  • UHD TVs
  • Lighting equipment


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