onsemi Resonant controller (PFM)
With synchronous rectifier control, enhanced light load advanced secondary side LLC - NCP4390DR2G
The NCP4390 is an advanced Pulse Frequency Modulated (PFM) controller for LLC resonant converters with Synchronous Rectification (SR) that offers best in class efficiency for isolated DC/DC converters. It 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.
Key features
- Charge Current Control
- Adaptive SR with Dual edge Tracking
- Green Functions, provide wider PWM mode entry level including PWM disable
- Closed Loop Soft-Start
Additional features
- Charge current control
- Adaptive SR with dual edge tracking
- Green functions, provide wider PWM mode entry level including PWM disable
- Closed Loop Soft-Start
- Programmable dead times
- Non-ZVS protection
- Wide operating frequency (39 kHz ~ 690 kHz)
- Protection functions with Auto-Restart - Over-Current protection
- Wide operating temperature range -40°C to +125°C
Applications
- High efficiency 100W to 2000W power supplies
- Large LED displays
- Telecom Front-End power
- Industrial power systems
- Computing power
- Entry level servers
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