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.
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
- 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
Benefits
- Enables High Efficiency & Compact Design
- Optimized Efficiency For High Power Design
- Optimized Performance Across Power Levels
- Prevents Operation in Audible Range
- Complies with Energy Efficiency Regulatory Standards
- Cycle-by-Cycle Current Limit Without Hall Effect Sensor
- Simplifies Design & Reduces External Components
- Complies with Energy Efficiency Regulatory Standards
- Allows Communication with Downstream Converter to Optimize System Performance
Applications
- Power Factor Correction
- Offline Power Supply
End Products
- Server Power
- Telecom 5G Power
- Networking Power
- Gaming Console Power Supplies
- UHD TV Power Supplies
- Industrial Power Supplies
Documents
➤ NCP1681 Product Overview➤ TND6361/D Technical Article
