The FAN604 is an advanced PWM controller aimed at achieving power density of ≥10W/in 3 in universal input range AC/DC flyback isolated power supplies. It incorporates Quasi - Resonant (QR) control with proprietary Valley Switching with a limited frequency variation. QR switching provides high efficiency by reducing switching losses while Valley Switching with a limited frequency variation bounds the frequency band to overcome the inherent limitation of QR switching. FAN604 features mWSaver? burst mode operation with extremely lowoperating current (300 μA) and significantly reduces standby powerconsumption to meet the most stringent efficiency regulations such asEnergy Star’s 5 - Star Level and CoC Tier II specifications . FAN604 includes several user configurable features aimed at optimizing efficiency, EMI and protections.FAN604 has a wide blanking frequency range that improves light load efficiency and eliminating audio noise for adaptive application.It incorporates user - configurableconstant currentreference ,which allows controlling themaximum output current fromprimary - side , therebyoptimizing transformer design to improve theoverall efficiency . It also includes several rich programmable protection features such as over - voltage protection (OVP), precise constant output current regulation (CC).

• Higher Average Efficiency by Quasi-Resonant Switching Operation with Wide Blanking Time Range
• mWSaver? Technology for Ultra Low Standby Power Consumption (
• Forced and Inherent Frequency Modulation of Valley Switching for Low EMI Emissions and Common Mode Noise
• Built-In and User Configurable Over-Voltage Protection (OVP), Under-Voltage Protection (UVP) and Over-Temperature Protection (OTP)
• Programmable Over-Temperature-Protection through External NTC Resistor
• Fully Programmable Brown-In and Brownout Protection
• Built-In High-Voltage Startup to Reduce External Components