NCP1681数据手册ONSEMI中文资料规格书

描述 Description

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.

特性 Features

• Totem Pole PFC Topology Eliminates Input Diode Bridge
• Enables High Efficiency & Compact Design
• Continuous Conduction Mode (CCM) Operation At High Power Level
• Optimized Efficiency For High Power Design
• Optional Multi-mode Operation With CCM at High Power & CrM at Medium Power Level
• Optimized Performance Across Power Levels
• Frequency Foldback in DCM With 25 kHz Minimum Frequency
• Prevents Operation in Audible Range
• Skip Mode in Very Light Load Condition
• Complies with Energy Efficiency Regulatory Standards
• Novel Current Sense Scheme
• Cycle-by-Cycle Current Limit Without Hall Effect Sensor
• Digital Voltage Loop Compensation
• Simplifies Design & Reduces External Components
• AC Line Monitoring Circuit & AC Phase Detection
• Simplifies Design & Reduces External Components
• Near Unity Power Factor in All Operating Modes
• Complies with Energy Efficiency Regulatory Standards
• PFC OK Indicator
• Allows Communication with Downstream Converter to Optimize System Performance

应用 Application

• Power Factor Correction
• Offline Power Supply
• Server Power
• Telecom 5G Power
• Networking Power
• Gaming Console Power Supplies
• UHD TV Power Supplies
• Industrial Power Supplies