NCP4390中文资料谐振控制器，同步整流器控制，增强式轻负载数据手册ONSEMI规格书

描述 Description

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. 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.

特性 Features

• Charge Current Control
• Excellent Transient response and Easy feedback Loop Design
• Adaptive SR with Dual edge Tracking
• Best In Class Efficiency
• Green Functions, provide wider PWM mode entry level including PWM disable
• Improved Light Load Efficiency
• Closed Loop Soft-Start
• Monotonic Rising Output
• Programmable dead times
• Reliable and flexible design
• Non-ZVS Protection
• High system reliability
• Wide Operating Frequency (39 kHz ~ 690 kHz)
• Protection Functions with Auto-Restart- Over-Current Protection (OCP)- Output Short Protection (OSP)- Power Limit by Compensation Cutback (Frequency Shift)- Overload Protection (OLP) with Programmable Shutdown Delay Time- Over-Temperature Protection (OTP)
• Wide Operating Temperature Range -40°C to +125°C

应用 Application

• High Efficiency 100W to 2000W Power Supplies with PFC pre-regulators
• Large LED Displays
• Telecom Front-End Power
• Industrial Power Systems
• Computing Power
• Entry level Servers