onsemi NCV4390 Automotive Resonant Converter Controllers

onsemi NCV4390 Automotive Resonant Converter Controllers are designed for LLC resonant converters with Synchronous Rectification (SR). The controller offers best-in-class efficiency for isolated DC/DC converters. The NCV4390 employs a current mode control technique based on a charge control, where the triangular waveform from the oscillator is combined with the integrated switch current information to determine the switching frequency. This provides a better control-to-output transfer function of the power stage simplifying the feedback loop design while allowing true input power limit capability. Closed-loop soft-start prevents saturation of the error amplifier and allows monotonic rising of the output voltage regardless of load condition. A dual-edge tracking adaptive dead-time control minimizes the body diode conduction time thus maximizing efficiency.