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