NCP1681

Totem Pole Power Factor Correction Controller NCP1681

ConductionMode(CCM)PowerFactorCorrection(PFC)controller ICdesignedtodrivethebridgelesstotempolePFCtopology.The bridgelesstotempolePFCconsistsoftwototempolelegs:afast? switchinglegdrivenatthePWMswitchingfrequencyandasecond legthatoperatesattheAClinef

NCP1681

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

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.

P1681NLT

SMTPowerInductorsPowerBeads-Volta1&2series

P1681NLT

SMTPowerInductors

PCM1681

24-Bit,192-kHzSampling,EnhancedMultilevelDelta-Sigma,Eight-ChannelAudioDigital-to-AnalogConverter