FAN6300

FAN6300 — Highly Integrated Quasi-Resonant Current Mode PWM Controller October 2008 FAN6300 Highly Integrated Quasi-Resonant Current Mode PWM Controller Features ƒ High-Voltage Startup ƒ Quasi-Resonant Operation ƒ Cycle-by-Cycle Current Limiting ƒ Peak-Current-Mode Control ƒ Leading-Edge Blanking ƒ Internal Minimum tOFF ƒ Internal 2ms Soft-Start ƒ Over-Power Compensation ƒ GATE Output Maximum Voltage ƒ Auto-Recovery Short-Circuit Protection (FB Pin) ƒ Auto-Recovery Open-Loop Protection (FB Pin) ƒ VDD Pin & Output Voltage (DET Pin) OVP Latched Applications ƒ AC/DC NB Adapters ƒ Open-Frame SMPS Description The highly integrated FAN6300 PWM controller provides several features to enhance the performance of flyback converters. A built-in HV startup circuit can provide more startup current to reduce the startup time of the controller. Once the VDD voltage exceeds the turn-on threshold voltage, the HV startup function is disabled immediately to improve power consumption. An internal valley voltage detector ensures the power system operates at Quasi-Resonant operation in widerange line voltage and any load conditions and reduces switching loss to minimize switching voltage on drain of power MOSFET. To minimize standby power consumption and light-load efficiency, a proprietary green-mode function provides off-time modulation to decrease switching frequency and perform extended valley voltage switching to keep to a minimum switching voltage. FAN6300 controller also provides many p...