... References FAN480X — PFC/ Forward PWM Controller Combo (FAN4800, FAN4801, FAN4802) AN-6078SC — FAN480X PFC+ PWM Combo Controller Application AN-6004 — 500W Power Factor Corrected (PFC) Design ... www.fairchildsemi.com Rev. 1.0.0 • 8/26/09 4 RT/CTOPFCOPWMOPWM (FAN4800C, FAN4802/2L) PFC dead time Figure 9. FAN480X Timing Diagram PWM Stage The PWM stage is capable of current-mode or voltage-mode ... 1/()1/FBPWMCZ CZBOOCP OS D F OS D FvssRvvs R RCs R RCsωωω ++ =− ⋅ + + ))) (53) where: 121221(// )11()CPBBBCZFFCZFOS FRRCRCRRCωωω=== + (54) FBPWMVREFRB1RBCBRDRFCFROS2ROS1ROS3KA431VO2VO1...