The converters operate with variable frequency which is a function of the load and the instantaneous input / output voltages. The switching frequency is limited between 18kHz and 600kHz. The Pulse Width Modulators implement voltage-mode control with input voltage feed forward. When configured for PFC applications, the slow voltage regulation loop results in constant on-time operation within a line cycle. This PWM method combined with the BCM operation of the boost converters provides automatic power factor correction. The FAN9612 offers bias UVLO, input brown-out, input over-voltage, over-current, open feedback, overtemperature, output over-voltage and redundant latching over-voltage protections. Furthermore, the converters' output power is limited independently of the input RMS voltage. Synchronization between the power stages is maintained under all operating conditions. The FAN9612 is available in Lead(Pb)-Free 16-lead SOIC package.