Offline Quasi-Resonant PWM Controller

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Overview

The FAN602F is an advanced PWM controller aimed at achieving power density of ≥10W/in³ 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.
FAN602F features mWSaver® burst mode operation with extremely low operating current (300 µA) and significantly reduces standby power consumption to meet the most stringent efficiency regulations such as Energy Star’s 5-Star Level and CoC Tier II specifications.
FAN602F includes several user configurable features aimed at optimizing efficiency, EMI and protections. FAN602F has a programmable switching frequency range that provides flexibility in choosing noise rejection in targeted frequency zones. It incorporates user-configurable minimum peak current, which allows controlling the burst mode entry/exit power level, thereby enhancing light-load efficiency and eliminating audible noise. It also includes several rich programmable protection features such as Over-Voltage Protection (OVP), precise constant output current regulation (CC) and Over-Temperature Protection (OTP) through external thermistor.

  • High Efficiency Across Wide Input and Output Conditions in a Small Form Factor
  • Quasi-Resonant Switching Operation with Two Step Maximum Blanking Frequency (140 kHz and 75 kHz)
  • User Configurable Burst Mode Entry and Exit to Maximize Light-Load Efficiency and Minimize Audible Noise
  • Adaptive Burst Mode Entry Level for Adaptive Charger Application
  • mWSaver® Technology for Ultra Low Standby Power Consumption (<20 mW)
  • 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)
  • Fully Programmable Brown-In and Brownout Protection
  • Precise Constant Output Current Regulation with Programmable Line Compensation
  • Built-In High-Voltage Startup to Reduce External Components
  • 10 Lead SOIC JEDEC

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