onsemi Multi-mode controller NCP1681
Totem pole continuous conduction mode (CCM) / Multi-mode (CrM-CCM) power factor correction controller
The NCP1681 is a PFC controller IC designed to drive 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 controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.
Key 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 & CrM at medium power level
- Frequency foldback in DCM with 25 kHz minimum frequency
Additional features
- Skip mode in very light load condition
- Novel current sense scheme
- Digital voltage loop compensation
- AC line monitoring circuit & AC phase detection
- Near unity power factor in all operating modes
- PFC OK indicator
Applications
- Power factor correction
- Offline power supply
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