The FAN7527 is an active power factor correction (PFC) controller for boost PFC application which operates in the critical conduction mode. It turns on MOSFET when the inductor current reaches zero and turns off MOSFET when the inductor current meets the desired input current reference voltage as shown in Fig. 1. In this way, the input current waveform follows that of the input voltage, therefore a good power factor is obtained.
The document provides an introduction to the FAN7527, an active power factor correction (PFC) controller designed for boost applications. It operates in critical conduction mode by turning on the MOSFET when inductor current reaches zero and turning it off based on a desired input current reference voltage.
| Operating Mode | Critical conduction mode |
|---|---|
| Application Type | Boost PFC application |
| Error Amp Non-Inverting Bias | 2.5V |
| Soft OVP Threshold Current | 30uA |
| Dynamic OVP Threshold Current | 40uA |
| Quiescent Current during OVP | 2mA |
| Multiplier Input Range Pin 3 | 0V to 3.8V |
| Error Amp Output Voltage Range | 2.25V to 6V |
| Zero Current Detector Hysteresis | 0.5V |
| Watchdog Timer Delay | 500us |
| Drive Output Peak Current | 500mA |
It operates in critical conduction mode.
Protection is triggered when the monitored current into the EA_OUT pin exceeds 40uA.
The static OVP activates and keeps the output stage and external power switch turned off.