FAN6300A Datasheet | Fairchild Semiconductor

FAN6300A/H - Highly Integrated Quasi-Resonant Current Mode PWM Controller December 2009 FAN6300A / FAN6300H Highly Integrated Quasi-Resonant Current Mode PWM Controller Features - - - - - - - - - - - - - - High-Voltage Startup Quasi-Resonant Operation Cycle-by-Cycle Current Limiting Peak-Current-Mode Control Leading-Edge Blanking (LEB) Internal Minimum t OFF Internal 5ms Soft-Start Over Power pensation GATE Output Maximum Voltage Auto-Recovery Over-Current Protection(FB Pin) Auto-Recovery Open-Loop Protection(FB Pin) VDD Pin and Output Voltage (DET Pin) OVP Latched Low Frequency Operation (below 100k Hz) for FAN6300A High Frequency Operation (up to 190k Hz) for FAN6300H Description The highly integrated FAN6300A/H of PWM controller provides several Features to enhance the performance of flyback converters. FAN6300A is applied on quasiresonant flyback converters where maximum operating frequency is below 100k Hz. FAN6300H is suitable for high-frequency operation (up to 190k Hz). 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 reduce power consumption. An internal valley voltage detector ensures power system operates at quasi-resonant operation over a wide-range of line voltage and any load conditions, as well as reducing 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. The operating frequency is limited by minimum toff time, which is 38µs to 8µs in FAN6300A and 13µs to 3µs in FAN6300H, so FAN6300H can operate at higher switching frequency than FAN6300A. FAN6300A/H controller also provides many protection functions. Pulse-by-pulse...