FAN6300A Datasheet | onsemi

Highly Integrated Quasi-Resonant Current Mode PWM Controller FAN6300A / FAN6300H 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 100 k Hz. FAN6300H is suitable for high- frequency operation (up to 190 k 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 t OFF time, which is 38 ms to 8 ms in FAN6300A and 13 ms to 3 ms in FAN6300H, so FAN6300H can operate at higher switching frequency than FAN6300A. FAN6300A/H controller also provides many protection functions. Pulse- by- pulse current limiting ensures the fixed- peak current limit level, even when a short circuit occurs. Once an open- circuit failure occurs in the feedback loop, the internal protection circuit disables PWM output immediately. As long as VDD drops below the turn- off threshold voltage, the controller also disables PWM output. The gate output is clamped at 18 V to protect the power MOS from high gate- source voltage conditions. The minimum t OFF time limit prevents the system frequency from being too high. If the DET pin triggers OVP, internal OTP is triggered and the power system enters latch- mode until AC power...