FAN6300A/H is a highly integrated quasi-resonant current mode PWM controller from Fairchild Semiconductor. It is suitable for low frequency (below 100kHz) quasi-resonant flyback converters and high frequency (up to 190kHz) flyback converters. The device features high-voltage startup, quasi-resonant operation, cycle-by-cycle current limiting, peak-current-mode control, leading-edge blanking (LEB), internal minimum tOFF, internal 5ms soft-start, over power compensation, 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 function.