FAN7528

The FAN7528 is an active power factor correction (PFC) controller for boost PFC applications that operates in critical conduction mode (CRM). It uses voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MOSFET turn-off signal. Because the voltage mode CRM PFC controller does not need the rectified AC line voltage information, it can save the power loss of the input voltage sensing network necessary for the current mode CRM PFC controller.

The FAN7528 provides the dual-output voltage control function without the AC line voltage sensing for adapter applications. It changes the PFC output voltage according to the AC line voltage.

It provides protection functions such as over-voltage protection, open-feedback protection, over current protection, and under voltage lock out protection. The FAN7528 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65uA. Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs.