Multiple control options for power factor correction and more with combo controllers
The NCP1681 drives bridgeless totem-pole power factor correction (PFC). This architecture features a fast switching leg driven at the PWM switching frequency in addition to a second leg operating at the AC line frequency.
Power stage efficiency is boosted by the elimination of the diode bridge which is used at the input of a conventional PFC circuit. The option to configure the NCP1681 in continuous conduction mode (CCM) or in multi-mode critical conduction mode and continuous conduction mode (CrM-CCM) adds to the design flexibility.
Combining a PFC and PWM controller the FAN4800AUPFC also adds protection against line sagging for power supplies which need to boost PFC and PWM, with few external components needed to enable versatile protection and compensation.
A PFC controller is combined with a quasi-resonant (QR) flyback controller in the FAN6921BMR which also features brown-out protection, to enable a cost-effect solution with fewer external components.
For higher power levels, the FAN9611 features an interleaved dual boundary-conduction-mode (BCM) PFC controller and operates two parallel-connected boost power trains which are 180° out of phase. This extends the power level from 300W to over 800W.