Item: Power MOSFET (with fast diode) 30NM60ND STI30NM60N I²PAK
The gain modulator is the key block for PFC stage because it provides the reference to the current control error amplifier for the input current shaping, as shown in Figure 2. The output current of gain modulator is a function of VEA, I AC , and VRMS. The gain of the gain modulator is given in the datasheet as a ratio between IMO and IAC with a given VRMS when VEA is saturated to HIGH. The gain is inversely proportional to VRMS 2 , as shown in Figure 3, to implement line feed-forward. This automatically adjusts the reference of current control error amplifier according to the line voltage such that the input power of PFC converter is not changed with line voltage.