onsemi NCP1681 Totem-Pole Power Factor Controller
onsemi NCP1681 Totem-Pole Power Factor Controller is a PFC controller optimized for driving the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. The NCP1681 Controller can be configured to operate in continuous conduction mode (CCM) or multi-mode (CrM-CCM) operation. The onsemi NCP1681 Totem-Pole Power Factor Controller is housed in a SOIC-20 package.
Features
- Totem-pole PFC topology eliminates input diode bridge
- Continuous conduction mode (CCM) operation at high power level
- Optional multi-mode operation with CCM at high power and CrM at medium power level
- Frequency foldback in DCM with 25kHz minimum frequency
- Skip mode in very light load condition
- Novel current sense scheme
- Digital voltage loop compensation
- AC line monitoring circuit and AC phase detection
- Near unity power factor in all operating modes
- Signal to indicate that the PFC is ready for operation ("pfcOK" pin)
Applications
- Power factor correction
- Server power
- Offline power supply
- Telecom 5G power
- Networking power
- Gaming console power supplies
- UHD TV power supplies
Videos
Development Tools
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