The NCP1680 is a Critical Conduction Mode (CrM) Power Factor Correction (PFC) controller IC designed to drive the bridgeless totem-pole PFC topology.
A power factor correction architecture, the bridgeless totem-pole comprises a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. The NCP1680 also has two field-effect transistors, the first in the low frequency diode leg and another in the boost converter.
In conventional PFC circuits, Bridge Diodes represent a major source of power loss due to a forward voltage. Replacing the Bridge Diode with a Totem Pole PFC topology achieves greater power stage efficiency and density. It also features an elegant 4 switch boost solution that reduces the number of components in the current path and eliminates the need for software coding. The NCP1680 is a compact and efficient PFC, ready for immediate use.
Features of the NCP1680:
- Input Voltage: 90 Vac ~264 Vac
- 20V15A 300W Output Power
- Totem Pole PFC+LLC Topology
- 94.5% Full Load Efficiency@90V Input
- Compact size: 110*62*24mm
Highlights:
- Constant on-time CrM and valley synchronised frequency foldback
- Novel accurate current sensing scheme
- Line polarity detection
- Novel valley sense scheme
- Control loop compensation
- Two low voltage pins for sensing and recreating half-wave sinusoid.
- DCM with valley synchronized turn-on for improved light load efficiency
- Zero current detection for CrM operation
- Integrated digital voltage loop control
Applications:
- Projector Charger
- Power board
- High Power adaptor
- USB PD ( PD3.1 )
- Telecom 5G Power supply
- Plant and LED lighting
- Gaming console Power Supplies
- E-bike charger
- Industrial Power Supplies
Block diagram
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